Reviewed on Apr 05, 2018 , Marc Henney, Yannick Khong

Sony WI-C400
HEADPHONES REVIEW

Usage Ratings - Version 1.2
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Test Benches: test

  • 1.2: Winter 2018
  • 1.1: Summer 2017
  • 1.0: Winter 2017
  • 0.9: Winter 2016
6.3
Mixed Usage
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What it is This is the combination of the different use cases to evaluate how versatile the headphones are. Therefore an everyday headphone should be well-rounded enough to adapt to most situations and environments without significant losses in sound quality, design ergonomics or isolation.
Score components:
6.2
Critical Listening
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What it is The level of audio fidelity a headphone can reproduce. Therefore a balanced and true representation of bass, mids, treble, soundstage and imaging, as well as a comfortable listening experience, is essential for critical listening.
Score components:
6.6
Commute/Travel
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What it is How well the headphones handle the loud environments involved in commuting or traveling. Therefore your listening experience should be comfortable, hassle-free and as isolated from noise as possible.
Score components:
7.2
Sports/Fitness
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What it is How well-adapted the headphones are, to use while doing sports or strenuous exercise. Therefore the headphones should not be too cumbersome and deliver a stable and comfortable listening experience.
Score components:
6.6
Office
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What it is How well the headphones can deliver a comfortable and isolated listening experience in an office-like environment. They should not leak much and should block the noise of a busy office.
Score components:
4.8
Home Theater
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Score components:
4.5
Gaming
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Score components:
Type : In-ear
Enclosure : Closed-Back
Wireless : Yes
Noise-Cancelling : No
Mic : Yes
Transducer : Dynamic

The Sony WI-C400 are average-at-best wireless in-ears with an easy-to-use control scheme and a long battery life. They're stable enough for sports use and have a decently comfortable fit, but they have a treble-heavy sound that may be a bit too piercing for some. They also lack a lot of bass. They won't be the best headphones for watching a lot of video content either and take a considerable amount of time to charge, but on the upside, they do not leak much even at high volumes.

See our recommendations for the best Earbuds.

Test Results
Design 6.9
Sound 6.0
Isolation 6.7
Microphone 6.4
Active Features 5.6
Connectivity 2.5
Pros
  • Lightweight and stable design.
  • Low leakage.
  • Long battery life.
Cons
  • Poor noise isolation.
  • Mediocre-at-best and slightly piercing sound.
  • High latency.

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6.9

Design

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Score components:
Sony WI-C400 Design Picture

The Sony WI-C400 are decent-looking headphones, with a slightly weak build quality. Like most in-ears, they are stable and very breathable making them an above-average option for sports. They're also decently portable if you don't mind dangling them around your neck. However, the neckband isn't as flexible as the BeastX so you won't be able to fit them in your pockets and unfortunately, their build quality doesn't feel as durable as other similarly designed headphones. The thin audio cables and cheap earbuds make the whole design feel less premium than most of the recent Sony headphones.

Style
Sony WI-C400 Design Picture 2

The Sony WIC400 look somewhat decent but feel a little cheap and fragile. They have a simple around-the-neck design, with a slim neckband stem and two thick plastic casings to house the electronics. The neckband has a matte finish and a decently polished design that makes them look a little more premium than some of the budget around-the-neck in-ears we've tested like the Mpow Jaws. Unfortunately, this is offset by the thin audio cables and the cheap-looking earbuds. Overall they have an understated style that will work for most but doesn't feel as high-end as some of the more recent Sony releases.

7.0 Comfort
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What it is: Adjustability and degrees of freedom, pressure, stiffness and weight.
When it matters: When the headphones are going to be used for long durations.
Score components: Subjectively assigned
Sony WI-C400 Comfort Picture
Weight : 0.08 lbs
Clamping Force
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What it is: The force that the headphones exert on your head, once you have them on. This is purely a measurement of the force applied, which does not take into account the earpad's surface area and the resulting pressure you will feel, on or around your ears.
When it matters: The tighter the headphones, the more force they put on your head. This can get uncomfortable or cause pain and soreness during long listening sessions.
:
0 lbs

The Sony WI-C400 have a decently comfortable around-the-neck design and in-ear fit. They're lightweight, and you can adjust the length of the cables so that they do not pull on the earbuds while not being too distracting like on the Mpow Jaws. Unfortunately, the earbud tips are pretty standard. You get 3 different sizes of silicon tips and no other accessories to improve comfort. They do not go in as deeply as some in-ears but if you are not the biggest fan of in-ear designs then you will have some of the same issues with these headphones.

7.4 Controls
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What it is: The control scheme of the headphones, the number of functions provided, button layout and ergonomics as well as the quality of tactile feedback.
When it matters: If you want to control volume, pause your music or make phone calls without directly interacting with your audio device.
Sony WI-C400 Controls Picture
Ease of use : Above-average
Feedback : Good
Call/Music Control : Yes
Volume Control : Yes
Microphone Control : No
Channel Mixing
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What it is: Being able to mix audio channels directly on the headphones.
When it matters: This is most useful when using a separate chat software so that you can mix in-game audio and chat audio depending on your needs.
:
N/A
Noise Canceling Control : N/A
Talk-Through : N/A
Additional Buttons : Bluetooth Sync

The Sony WI-C400 have a simple and efficient control scheme. They provide all the essential functions for a Bluetooth headphone; call/music, track-skipping, and volume controls (skipping tracks is done by holding down the volume buttons). Overall, the buttons are responsive and decently easy-to-use once you get familiar with the layout which doesn't take too long.

9.3 Breathability
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What it is: How hot the headphones get when you wear them for an extended period of time.
When it matters: If you often have long listening sessions or use your headphones while doing physical activities like running or working out.
Score components:
Sony WI-C400 Breathability After Picture
Avg.Temp.Difference : 0.7 C

The Sony WI-C400 like most in-ears are very breathable. They do not cover the outer-ear so they won't make you sweat more than usual when doing strenuous exercises or workout routines. They do trap a bit of heat within the ear canal, but it's negligible which makes them decently suitable for physical activity and sports.

7.0 Portability
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What it is: The volume of space occupied by the headphones when folded into their most compact format.
When it matters: If you're often on the move and need to carry your headphones in a bag, purse , or pocket.
Score components:
Sony WI-C400 Portability Picture
L : 6.5 "
W : 5.4 "
H : 1 "
Volume : 35 Cu. Inches
Stand required : N/A

These headphones are fairly portable and easy-to-carry around on your person, especially if you just let them dangle around your neck. However, they're not as flexible as the BeatsX so you can't fold and put them in your pocket. If you do not mind having them around your neck most of the time, then they won't be a hassle to carry around. Unfortunately, they don't come with case or pouch which is slightly disappointing.

0 Case
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What it is: The provided carrying options to protect your headphones when transporting them.
When it matters: To prevent damaging your headphones, if you often carry them in your bag or pocket.
Score components: Subjectively assigned
Type : N/A
L : N/A
W : N/A
H : N/A
Volume : N/A

These headphones do not come with a case or pouch.

6.5 Build Quality
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What it is: Durability, material quality, cheap/expensive feel.
When it matters: When the headphones are going to be used by multiple users (classes/studios), by children, in tough conditions, on a daily basis, or for exercise.
Score components: Subjectively assigned
Sony WI-C400 Build Quality Picture

These headphones have a slightly weak build quality but do not feel cheap like some of the budget around the neck designs we've tested. They have a decently flexible neckband that won't easily snap under physical stress, but it's not as flexible as the BeatsX so folding them past a certain point will damage the headphones. Unfortunately, the audio cables are thin and fragile, and the earbuds look and feel low-end. They feel better built than the Mpow Jaws but are not quite on the level of the Samsung U Flex or Level U Pro.

7.5 Stability
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What it is: How the headphones are designed to prevent them from slipping off your ears or falling off your head.
When it matters: If you plan on using the headphones while doing sports or other physical activities that requires a lot of movement.
Score components: Subjectively assigned
Sony WI-C400 Stability Picture

The WIC400 have a stable in-ear, around the neck design for running and sports. They stay put under most circumstances even during more intense physical activities. However, the audio cables leading to the earbuds are a little long and could get caught on an item of clothing which will pull them out of your ears. The neckband has a decent cable management system to mitigate this issue but getting the cable length just right requires a bit of adjustment from time to time. Also, the neckband will sometimes shift around depending on the item of clothing which pulls on cables and may cause the earbuds to slip out of your ears.

Cable
Sony WI-C400 Cable Picture
Detachable : N/A
Length : N/A
Connection : N/A

These headphones come with a micro USB charging cable.

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Headshots 1
Headshots 2
6.0

Sound

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What it is: How accurately the audio is reproduced. The tests are performed with the headphones' most commonly used features enabled (noise-cancelling, wireless, etc.)
Sony WI-C400 Frequency Response

The Sony WI-C400 is a mediocre sounding pair of closed-back in-ear headphones. They have a consistent bass, a good mid-range and very good imaging. However, their bass lacks quite a bit of thump and rumble, and is boomy. Their mid-range sounds a bit cluttered and too thick on vocals, and their treble is too bright and sharp, especially on S and T sounds. They also don't have a large and speaker like soundstage. Overall, they are not recommended for those who care about sound quality, unless they want to use it for listening to podcasts and audiobooks.

5.9 Bass
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What it is: Frequency Response from 20Hz-250Hz
When it matters: When the material is heavy on bass frequencies, such as those of kick drums and bass guitar.
Score components:
Sony WI-C400 Bass
Std. Err.
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What it is: The amount of deviation (weighted standard error) in bass frequency response (20Hz-250Hz) as compared to a target response that would sound perfectly balanced to most people.
When it matters: When a balanced and neutral (reference) bass performance is desired.
Good value: <4dB
Noticeable difference: 0.1dB
:
5.47 dB
Low-Frequency Extension
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What it is: The lowest frequency at which the frequency response reaches -3dB of the target response.
When it matters: Shows how extended the bass is.
Good value: <40Hz
Noticeable difference: 5Hz
:
63.5 Hz
Low-Bass
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What it is: The average amount of over/under-emphasis in frequency response from 20Hz-60Hz.
When it matters: Kick drums and low frequency effects get their 'thump' from this range. Mostly felt than heard.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-9.65 dB
Mid-Bass
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What it is: The average amount of over/under-emphasis in frequency response from 60Hz-120Hz.
When it matters: Melodic bass instruments have most of their fundamental frequencies in this range. This is where the 'body' and 'punch' of the bass sits.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-1.79 dB
High-Bass
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What it is: The average amount of over/under-emphasis in frequency response from 120Hz-250Hz.
When it matters: Most instruments get their warmth and full-ness from this range. When over-emphasized, mixes tend to get muddy and boomy.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
4.6 dB

The bass is sub-par. With the LFE (low-frequency extension) at 64Hz, and sub-bass lacking by more than 9dB, these headphones won't be able to produce much thump and rumble, which is quite common to bass heavy genres like Dubstep, Hip-hop, and EDM. This is in contrast with most closed-back in-ears like the BeatsX, X3 and Run, which can reach as low as 10Hz. Mid-bass, responsible for the body of bass guitars and punch of kick drums is lacking by about 2dB. On the other hand, high-bass is hyped by about 5dB, but this doesn't makeup for the lacking sub-bass and instead adds boominess and muddiness to the sound.

7.7 Mid
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What it is: Frequency Response from 250Hz-2KHz
When it matters: When the material is heavy on mid-range frequencies. This is the case for the majority of audio content.
Score components:
Sony WI-C400 Mid
Std. Err.
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What it is: The amount of deviation (weighted standard error) in mid frequency response (250Hz-2.5KHz) as compared to a target response that would sound perfectly balanced to most people.
When it matters: When a balanced and neutral (reference) mid performance is desired.
Good value: <4dB
Noticeable difference: 0.1dB
:
3.08 dB
Low-Mid
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What it is: The average amount of over/under-emphasis in frequency response from 250Hz-500Hz.
When it matters: Most instruments have their fundamentals or low harmonics in this range. Over-emphasis in this range sounds muddy and cluttered. Under-emphasis, thins out the vocals and lead instruments.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
4.07 dB
Mid-Mid
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What it is: The average amount of over/under-emphasis in frequency response from 500Hz-1KHz.
When it matters: This range is occupied mostly by upper harmonics. Over-emphasis sounds forward and boxy. Under-emphasis pushes instruments to the back of the mix.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
0.22 dB
High-Mid
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What it is: The average amount of over/under-emphasis in frequency response from 1KHz-2KHz.
When it matters: Most instruments, especially vocals, get their intensity and clarity from this range. Over-emphasis sounds honky and harsh, under-emphasis sounds weak and distant.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
2.54 dB

The Sony WI-C400 has a good mid-range. The 5dB bump in low-mid, which is the continuation of the high-bass overemphasis, thickens vocals and lead instruments and adds clutter to the overall mix. Also, the 3dB bump in high-mid, adds extra emphasis and projection to the higher harmonics of vocals and lead instruments which can make them sound a bit honky.

6.9 Treble
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What it is: Frequency Response from 2KHz-20KHz
When it matters: When the material is heavy on high-range frequencies, such as voice, cymbals, and any other material where brightness, brilliance and airiness is desired.
Score components:
Sony WI-C400 Treble
Std. Err.
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What it is: The amount of deviation (weighted standard error) in treble frequency response (2.5KHz-20KHz) as compared to a target response that would sound perfectly balanced to most people.
When it matters: When a balanced and neutral (reference) treble performance is desired.
Good value: <4dB
Noticeable difference: 0.1dB
:
4.37 dB
Low-Treble
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What it is: The average amount of over/under-emphasis in frequency response from 2KHz-5KHz.
When it matters: Almost all instruments rely on this range for their presence, detail, and articulation. Over-emphasis can sound harsh and painful. Under-emphasis hurts the comprehensibility of vocals and lead instruments.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
4.09 dB
Mid-Treble
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What it is: The average amount of over/under emphasis in frequency response from 5KHz-10KHz.
When it matters: This is the sibilance range. Cymbals, vocals, and lead instruments rely on this range for brightness and presence. Over-emphasis sounds piercing and painful, under-emphasis sounds dull and lispy.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
3.97 dB
High-Treble
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What it is: The average amount of over/under-emphasis in frequency response from 10KHz-20KHz.
When it matters: This range gives brilliance and airiness to the sound. Over-emphasis sounds hissy, under-emphasis sounds closed-up and lifeless.
Good value: +/-3dB
Noticeable difference: 0.1dB
:
-3.77 dB

The treble of the Sony C400 is about average. The overall response is quite even for most of the range, which is good. But low-treble and mid-treble are overemphasized by 4dB which adds excess brightness and presence to vocals, leads and cymbals. The bump around 9KHz also means that these headphones will sound noticeably sibilant (sharp on S and Ts), especially when considering their lacking bass.

Raw Frequency Response
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What it is: The average uncompensated frequency response of the headphone. For in-ears and earbuds, this corresponds to the average of 5 measurements/re-seats on the dummy head (HMS). For over/on-ear headphones, this corresponds to the average of 5 measurements/re-seats on the HMS (Head Measurement System) for the mid and treble ranges, and 5 measurements/re-seats on 5 human subjects for the bass range.
When it matters: This is for those who want to see the raw and uncompensated frequency response of the headphone. Some of the more advanced users, are able to read and evaluate headphone frequency response in its raw form and without compensation. This will be especially useful to them if they have their own headphone compensation/target curve, which may differ from the compensation curve/target response used by RTINGS.com.
Score components:
10 Frequency Response Consistency
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What it is: The amount of deviation of each frequency response pass, from the average frequency response.
When it matters: Shows how consistently the headphones perform after re-positioning them.
Score components:
Sony WI-C400 Consistency L Sony WI-C400 Consistency R
Avg. Std. Deviation
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What it is: The average amount of deviation in frequency response of 5 re-seats, from the average frequency response.
When it matters: Shows how consistently the headphones perform after re-positioning them.
Good value: <0.5
Noticeable difference: 0.1
:
0.0 dB

The Sony WI-C400 has excellent frequency response consistency. Assuming the user is able to achieve a proper fit and an air-tight seal using the assortment of tips that come with the headphones, then they should be able to get consistent bass and treble delivery every time they use the headphones. It should be noted, however, that this headphone was measured only once (instead of the usual five), in order to the reduce the wear and tear on our dummy head.

8.1 Imaging
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What it is: Imaging qualities are inherent to the audio content, the headphones have to 'reproduce' them rather than 'create' them. They determine how accurately the objects are positioned in the stereo image, and how transparent the imaging is.
When it matters: When accurate positioning of the objects in the stereo image, and clear and transparent imaging is desired.
Sony WI-C400 Group Delay Sony WI-C400 Phase Response
Weighted Group Delay
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What it is: The average amount of group delay calculated based on a perceptual weighting filter. Group delay indicates how long it takes for each frequency to reach their maximum amplitude. This is a monaural quality and can be perceived even with one ear.
When it matters: Headphones with lower group delay have more transparent imaging and a tighter bass. Headphones with higher group delay in the bass range tend to have a wimpy and loose bass, and headphones with higher group delay in the treble range tend to have a less transparent imaging.
Good value: <0.5
Noticeable difference: 0.1
:
0.16
Weighted Amplitude Mismatch
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What it is: The Left/Right balance of our test unit, that is, the amount of amplitude difference between the left and right drivers. This is not a design test, but a marker for manufacturing tolerance and ergonomics.
When it matters: When a properly balanced stereo image and low manufacturing tolerance is desired. A poor score indicates a noticeable difference in level between the left and right drivers.
Good value: <1.5
Noticeable difference: 0.1
:
1.0
Weighted Frequency Mismatch
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What it is: The amount of difference (Std. Err.) between the frequency response of the left and right drivers of our test unit. This is not a design test, but a marker for manufacturing tolerance and ergonomics.
When it matters: When an even and stable stereo image, as well as a low manufacturing tolerance, is desired. A poor score indicates there may be 'holes' in the stereo image at certain frequencies.
Good value: <2
Noticeable difference: 0.1
:
3.0
Weighted Phase Mismatch
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What it is: The amount of difference (Std. Err.) between the phase response of the left and right drivers of our test unit. This is not a design test, but a marker for manufacturing tolerance and ergonomics.
When it matters: When an even and stable stereo image, as well as a low manufacturing tolerance is desired. A poor score indicates there may be inaccuracies in the stereo image reproduction at certain frequencies.
Good value: <16
Noticeable difference: 3
:
4.77

The imaging is great. The weighted group delay is at 0.16, which is very good. The GD graph also shows that the entire group delay response is below the audibility threshold, suggesting a tight bass reproduction and a transparent treble. The large group delay swings below 20Hz fall below the human auditory range, so should not have a significant effect. Additionally, the L/R drivers of our test unit were well-matched in amplitude, frequency, and phase response, which is important for the accurate placement and localization of objects (voices, instruments, video games effects) in the stereo image.

1.5 Soundstage
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What it is: Soundstage qualities are not inherent to the audio content, the headphones have to 'create' them rather than 'reproduce' them. They determine whether the sound is perceived to be coming from inside or in front of the head, how open and spacious the soundstage is, how much the headphones acoustically interact with the environment, and how strong the phantom center is.
When it matters: When an accurately produced, large and spacious soundstage, similar to that of a stereo loudspeaker setup is desired.
PRTF Accuracy (Std. Dev.)
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What it is: The standard deviation of the PRTF (Pinna-related transfer function) of the headphones compared to a reference loudspeaker's PRTF at 30°. This quality is monaural and can be perceived even with one ear. This test does not apply to in-ears and earbuds, due to the lack of pinna interaction.
When it matters: An accurate pinna activation is mainly responsible for how natural and speaker-like the soundstage is perceived to be. The less error in the shape of the PRTF, the more natrual and speaker-like the perception of the soundstage will be. High amounts of error may indicate a soundstage that is unnatural or odd.
Good value: <2.5
Noticeable difference: 0.1
:
N/A
PRTF Size (Avg.)
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What it is: The average amplitude of the PRTF (Pinna-related transfer function) of the headphones compared to that of a reference loudspeaker's PRTF at 30°. This quality is monaural and can be perceived even with one ear. This test does not apply to in-ears and earbuds, due to the lack of pinna interaction.
When it matters: This value is responsible for the perceived size of the soundstage. The higher the value, the larger the perceived size of the soundstage. However, values above the reference (5.0dB) could result in a soundstage that is perceived as unnatural or odd.
Good value: >3.7
Noticeable difference: 0.1
:
N/A
PRTF Distance
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What it is: The depth of the "10KHz notch" of the headphone's PRTF, which is caused by phase cancellations at the concha. This quality is monaural and can be perceived even with one ear. This test does not apply to in-ears and earbuds, due to the lack of pinna interaction.
When it matters: This value is mainly responsible for the perceived distance and elevation of the soundstage. A small distance value may result in a soundstage that is perceived to be located inside the head. Larger values may help pull the soundstage out from inside of the head and bring it to the front.
Good value: >13
Noticeable difference: 1
:
N/A
Openness
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What it is: How open the headphones are, and how open and spacious they sound. This quality is monaural and can be perceived even with one ear. This test differentiates between acoustically and electronically produced crosstalk and only takes the acoustically generated crosstalk into account. This value is the inverse of the Noise Isolation test score, and could be indirectly related the acoustic impedance of the headphones.
When it matters: When a headphone with a sense of an open, and spacious soundstage is desired. A value of 10 indicates a fully open headphone, and a value of 0 indicates a fully closed headphone.
Good value: >7.5
Noticeable difference: 0.5
:
4.2
Acoustic Space Excitation
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What it is: How loud the headphones are, and how much they excite their environment acoustically. If the headphones are loud and open enough, the sound leaking from the headphones will be affected by the environment (reflections/reverb) before reflecting back into the open headphones and to the listener's ears. This quality is monaural and can be perceived even with one ear. This value is the inverse of the Leakage test score.
When it matters: Headphones with higher excitation values, similar to openness, tend to have soundstages that are perceived as more open and spacious.
Good value: >7.5
Noticeable difference: 0.5
:
1.6
Correlated Crosstalk
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What it is: How strong and solid the phantom center is. This is mostly a stereo quality and its effects on mono content are minimal. This test is sensitive to the phase of the crosstalk and whether it is produced acoustically or electronically.
When it matters: When a true reproduction of the stereo image is desired. A value of 0 indicates no crosstalk, or that the existing crosstalk is not correlated enough to affect the phantom center. A negative score means the crosstalk is out of phase with the original signal, resulting in a slightly wider stereo image at the expense of creating a 'hole' at the center of the stereo field. A positive score means the crosstalk is in phase and positively affecting the phantom center.
Good value: >1dB
Noticeable difference: 0.3dB
:
0.0 dB

The soundstage is poor. Since creating a large and speaker-like soundstage is partially dependent on having a speaker-like pinna activation, and in-ear headphones bypass the pinna (the outer ear) and don't interact with it, their soundstage will be perceived to be small and located inside the listener's head. Their closed-back design also means that their soundstage won't feel and open as open-back earbuds like the AirPods and the SoundSport Free.

6.5 Total Harmonic Distortion
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What it is: The subtle, unwanted frequencies (harmonics) produced alongside the intended frequencies.
When it matters: When clean and pure sound reproduction is desired, though its effect is not as noticable as frequency response.
Score components:
Sony WI-C400 Distortion
Weighted THD @ 90
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What it is: The overall amount of harmonic distortion measured at 90dB SPL. To make the score more perceptually relevant, more weight is given to the higher frequencies.
When it matters: How pure the sound is at moderate listening levels.
Good value: <0.100
Noticeable difference: 0.1
:
17.283
Weighted THD @ 100
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What it is: The overall amount of harmonic distortion measured at 100dB SPL. To make the score more perceptually relevant, more weight is given to the higher frequencies.
When it matters: How pure the sound is at loud listening levels.
Good value: <0.300
Noticeable difference: 0.1
:
4.994

The harmonic distortion of the C400 is about average. The overall amount of THD is elevated, especially in the bass mid-range. This could make the sound of those frequencies a bit of harsh and brittle which will mostly affect vocals and lead instruments. The shape of the bump in the bass range at 100dB SPL also suggests that these headphones are not capable of producing a lot of bass, and won't respond well to EQ boost in the bass range.

6.7

Isolation

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Score components:

The Sony WI-C400 only isolate passively against ambient noise. They create a somewhat decent seal that prevents a lot of leakage and blocks some high-frequency noise. Unfortunately, it is not enough for the rumbling sounds and ambient chatter of public transit, so you will hear what's going on around you especially in loud environments. On the upside, since they barely leak you can really turn up the volume level of your music to mask some of the ambient noise. 

5.7 Noise Isolation
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What it is: How much outside noise is blocked out by putting the headphones on.
When it matters: If the headphones are going to be used in a noisy envinronment (airplane, subway, etc.)
Score components:
Sony WI-C400 Noise Isolation
Overall Attenuation
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What it is: The overall amount of environmental noise reduction in dB.
When it matters: In loud envinronments like planes, trains, offices, etc.
Good value: <-20dB
Noticeable difference: 1dB
:
-16.07 dB
Bass
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What it is: The overall amount of noise isolation in the bass range (20Hz-250Hz).
When it matters: When the outside noise is bass-heavy, like in airplanes.
Good value: <-15dB
Noticeable difference: 1dB
:
-0.69 dB
Mid
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What it is: The overall amount of noise isolation in the mid-range (250Hz-2.5KHz).
When it matters: When the environment's noise is mid-heavy, like in an office.
Good value: <-15dB
Noticeable difference: 1dB
:
-13.69 dB
Treble
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What it is: The overall amount of noise isolation in the treble range (2.5KHz-20KHz).
When it matters: When the environment's noise is treble-heavy. Although uncommon, areas with sharp sounds fall under this category.
Good value: <-30dB
Noticeable difference: 1dB
:
-34.98 dB
Self-Noise
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What it is: The amount of noise created by the active electronics of the headphones (if applicable), measured from 300Hz-20KHz. Applies mostly to wireless and noise-cancelling headphones.
When it matters: If too loud, it could become distracting when listening to quiet material like podcasts and audiobooks.
Good value: <16dB
Noticeable difference: 1dB
:
20.34 dB

The Sony WI-C400 has a sub-par isolation. They don't have ANC (active noise cancelling) and don't isolate in the bass range at all, which is occupied by the rumble of airplane and bus engines. In the mid-range, important for blocking out speech, they achieved about 14dB of isolation, which is above-average. However, they reduce outside noise in the treble range by about 35dB which is good for cutting out sharp sounds like S and Ts.

8.6 Leakage
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What it is: The amount of sound bleeding out of the headphones.
When it matters: When the listener doesn't want people around them (in office, recording studio, etc.) to hear what is being listened to.
Score components:
Sony WI-C400 Leakage
Overall Leakage @ 1ft
Show Help
What it is: The amount of sound leakage heard 1 foot away from the user, while the user is listening to a 100dB SPL signal.
When it matters: When you don't want people hear what you are listening to.
Good value: <35dB
Noticeable difference: 1dB
:
30.12 dB

The leakage performance of the Sony WI-C400 is great. Like most other in-ear headphones, the Sonys don't leak in the bass and mid ranges and the significant portion of the leakage is in a narrow range in treble between 3KHz and 6KHz. This means that the leakage will mostly consist of sharp sounds like S and Ts. The overall level of the leakage is not very loud either. With the music at 100dB SPL, the leakage will peak at around 60dB SPL at 1 foot away, which is just above the noise floor of most offices.

6.4

Microphone

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What it is: The microphone section shows the quality of speech capture and transmission by the mic, as well as how well the microphone under test handles noisy environments.
When it matters: For your speech to be transmitted to and understood properly by the listener, the microphone needs to have a good recording quality. If the environment the microphone is being used in is noisy, a microphone with a good noise handling performance would be needed as well.
Score components:
Integrated
Show Help
What it is: The microphone integrated in the ear cup or ear bud of a wireless headphone.
When it matters: For calls, gaming and voice over IP software or for any other use of the microphone.
Good value: Yes
:
Yes
In-line
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What it is: The microphone inside the in-line remote of audio cables for wired and wireless headsets.
When it matters: In-line microphone are usually better than integrated mics. If you need better recording quality and noise handling for calls, gaming and voice over IP software then use the audio cable of your wired or wireless headphone if it has an inline microphone.
Good value: Yes
:
No
Boom
Show Help
What it is: A typically better microphone, that's also adjustable and extends so that the mic is closer to your mouth.
When it matters: Much better recording quality and noise handling than in-line or integrated mics. Primarily used for gaming and voice over IP software.
Good value: Yes
:
No
Detachable Boom
Show Help
What it is: A boom mic that is detachable from the headset.
When it matters: If you want to use your headphone outdoors without the bulk and hassle of the Boom mic.
:
N/A

The integrated microphone of the Sony WI-C400 has below-average performance. In quiet environments, speech recorded or transmitted with it will sound quite muffled and lacking in detail, which could make the speech a bit difficult to understand at times. It is also prone to picking up unwanted thump and rumble from the environment. In noisy environments, they are able to separate speech from background noise in moderately loud places like a busy street, but they will struggle in very loud situations like a subway station or gaming competition.

6.1 Recording Quality
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What it is: Microphone recording quality shows how natural, neutral, extended and intelligible speech would be with the device under test, in a quiet environment.
When it matters: A microphone with a good recording quality ensures that the person listening to you would hear a full, clear, and easily understandable speech. Therefore, it is important whenever a good quality of speech transmission and intelligibility is needed.
Score components:
Sony WI-C400 Microphone Frequency Response
Recorded Speech
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What it is: Actual audio recording of the headphone's microphone, recorded while placed on the dummy head, with speech being played back through the dummy head's mouth simulator.
When it matters: When a clean, full, and intelligible speech transmission is required.
:
LFE
Show Help
What it is: Low-frequency extension shows how deep the bass response of the microphone is, and therefore, how deep and full your voice would sound to the listener. It is the lowest frequency at which the frequency response reaches -3dB of the target response.
When it matters: LFE is not a big factor in speech intelligibility and even speech recorded with a mic that has an LFE of 500Hz could still be easily understood. Therefore, it is mostly important if you are concerned with how deep and full your voice would be heard.
Good value: <150Hz
Noticeable difference: 30Hz
:
164.69 Hz
FR Std. Dev.
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What it is: Frequency Response Standard Deviation shows how accurately and balanced sound is captured by the microphone at each frequency. FR Std. Dev. is calculated between LFE and HFE, and the rest of the spectrum is ignored.
When it matters: A good frequency response is desired when a natural and neutral speech quality is desired. As opposed to HFE which is more a metric for speech intelligibility, frequency response could be considered as a metric for a natural and neutral sound.
Good value: >3.5dB
Noticeable difference: 0.5dB
:
2.11 dB
HFE
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What it is: High-frequency extension is the highest frequency at which the frequency response reaches -3dB of the target response. It shows how extended the treble response of the microphone is.
When it matters: HFE is one the most important factors in speech intelligibility. The higher the HFE, the brighter, more open, and more extended the speech quality will be which makes it a lot easier to understand by the listener.
Good value: >8KHz
Noticeable difference: 1KHz
:
1836.52 Hz
Weighted THD
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What it is: The unwanted frequencies (harmonics) produced alongside the intended frequencies, which cause deformation of an output signal compared to its input.
When it matters: When clean and pure sound reproduction is desired, though its effect is not as noticable as frequency response.
Good value: <1.5
Noticeable difference: 1.0
:
3.049
Gain
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What it is: Shows how much louder the microphone can go above our reference loudness level. The gain value is reported relative to our reference level, which is 94dB at a distance of 5cm from the mouth.
When it matters: A microphone with a high gain is important when the input signal (speech) is very quiet. For example when whispering, or talking on the phone in a library.
Good value: >18dB
Noticeable difference: 3dB
:
43.18 dB

The mic has a mediocre recording quality. This microphone has a pretty good bass extension, but the build up in the sub-bass range (below 60Hz) means they are prone to capturing unwanted thump and rumble from the environment. The HFE (high-frequency extension) of 1.8KHz is rather poor and indicates a recorded/transmitted speech that lacks quite a bit of detail and brightness. This will negatively affect the intelligibility of speech, so they are not the best microphone for making calls.

6.8 Noise Handling
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What it is: How well the microphone is able to separate speech from background noise, so that the transmission would include more voice and less noise.
When it matters: When a clean and intelligible speech transmission is desired in a noisy situation like talking on the phone on a busy street or on the bus.
Score components:
Sony WI-C400 SpNR
Speech + Pink Noise :
Speech + Subway Noise :
SpNR
Show Help
What it is: Speech to Noise Ratio is the difference in level between speech and background noise as heard by the listener
When it matters: If the microphone is going to be used in a noisy environment, it is important for it to be able to separate the speech from background noise, so the voice would be easily audible and understandable.
Good value: >24dB
Noticeable difference: 3dB
:
19.23 dB

The noise handling of the WI-C400's microphone is decent. In our SpNR test, they achieved a speech-to-noise ratio of 19dB, meaning they are best suited for quiet and moderately loud environments. However, they will struggle to separate speech from ambient noise in very loud places.

5.6

Active Features

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What it is: Headphones with active components that require a battery. This includes noise cancelling and wireless headphones that actively reduce noise or transmit audio via a wireless connection.
When it matters: How suitable the power and wireless specifications of an active headphone will be, depending on your listening habits. The range and/or discharge time of the active headphone you select will be important if you're often on the move or have long uninterrupted listening sessions.
Score components:

The Sony WIC400 have a long lasting battery life but take a surprisingly long time to charge. They have about 17.5 hours of continuous playtime on average but take a little over 4 hours to charge, which is very high for a simple Bluetooth headphone. They also do not have a lot of power saving features which makes their battery performance slightly worse. Unfortunately, they do not support the Sony| Headphones Connect app so they do not have the customization options of the more premium Sony models.

6.2 Battery
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What it is: The power source of your headphones. All headphones with active features have a battery that will deplete over time.
When it matters: To continue using the active features of your headphones. Some models lose features or switch off completely when the battery is drained, which limits what you can do with them until the next charge.
Battery Type
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What it is: The type of battery that the headphones use. Usually AAA or embedded, Li-ion rechargeable batteries.
When it matters: When your headphones run out of power. Rechargeable batteries usually charge via the headphones Micro-USB port whereas AAA batteries have to be replaced or charged with an external device.
:
Rechargable
Battery Life
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What it is: The amount of time it takes for a headphones' battery to be completely drained. Battery life will vary depending on the active features used and volume level.
When it matters: For active headphones that connect wirelessly, have noise cancellation or other audio-enhancing features, that cease to work once the battery is dead.
Good value: >10hrs
Noticeable difference: 0.5hrs
:
17.5 hrs
Charge Time
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What it is: The amount of time your active headphones have to be connected to a power source to charge from 0 to a 100%. However, charging time will vary depending on your power source.
When it matters: To be able to use the active features of your headphones. Especially, wireless ones that completely switch off and need to be recharged when the battery is dead.
Good value: 2h or less
Noticeable difference: 0.25h
:
4 hrs
Power Saving Feature
Show Help
What it is: A feature that turns off the headphones, after a set time, when they're not in use.
When it matters: To prolong battery life when the headphones are not being used, or if you forget to manually turn off your headphones.
:
No
Audio while charging
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What it is: Some active headphones remain usable while charging. They continue to stream audio and do not disable other active features.
When it matters: This makes sure that your headphones's battery are not being drained when your relatively close to a power source. However, this means wireless headphones will need a wired connection to the power source during the charging process.
:
No
Passive Playback
Show Help
What it is: Active headphones that still work when all their active features are turned off or out of power.
When it matters: If you run out of power and do not have spare AA/AAA batteries or access to a power source to recharge your headphones.
:
No

These headphones have a long battery life of 17.5 hours but also a long charge time. They will easily last you the entire day even if your a heavy user but the 4 hours of charge time means you have to leave them charging overnight. They benefit from a somewhat decent quick charge feature, that gives you an hour's worth of playback from a 15 minute charge, but the 4 hours total charge time may be a deal breaker for some, especially since they do not have power saving features like an auto-off timer or audio while charging.

0 App Support
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What it is: The additional app provided to enhance your listening experience. They typically deliver a set of practical features that give you more control over the sound, noise cancelling and effects that the headphones produce.
When it matters: An app with a lot of features allows you to customize your listening experience to suit your taste and preferences. For example, additions like an equalizer can give you more bass or treble and room effects can simulate a bigger Soundstage in closed back headphones.
Score components: Subjectively assigned
App Name : N/A
iOS : N/A
Android : N/A
Mac OS : N/A
Windows : N/A
Equalizer
Show Help
What it is: Parametric, graphic or preset sound profiles that slightly alter the frequency response.
When it matters: If you want to tailor, your listening experience. Depending on what you're listening to you may want more or less bass for some tracks or more mid-range for vocals-heavy audio.
:
N/A
ANC control
Show Help
What it is: Control over the Active noise canceling technology. This could be either a simple on/off button, and adjustable slider or even adaptive self-regulating noise cancellation.
When it matters: If you're in an environment where you need to monitor your surroundings or completely isolate yourself from ambient noise.
:
N/A
Mic Control :
Room effects
Show Help
What it is: Room effects that enhance the audio quality to make it more immersive.
When it matters: If you want to further tweak your listening experience. Adding room effects, can simulate a more spacious Soundstage or deliver a surround sound-like feel.
:
N/A
Playback control
Show Help
What it is: An in-app player that gives you access to play/stop, track skipping or volume controls directly with the app.
When it matters: It's a shortcut that allows you to control your audio without leaving the application.
:
N/A
Button Mapping : N/A
Surround Sound : N/A

They do not support the headphones connect app from Sony which is disappointing.

2.5

Connectivity

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What it is: The inputs and outputs of wired and wireless headphones, as well as their latency performance and range.
When it matters: To know how compatible your Bluetooth device, console or PC will be with your wired or wireless headset.
Score components:
  • 10% Bluetooth
  • 32% Wired
  • 10% Base/Dock
  • 22% Wireless Range
  • 25% Latency

The Sony WI-C400 support NFC for easy pairing but cannot connect to multiple devices simultaneously. On the upside, they are fairly easy to pair even if you do not use NFC since they have a dedicated power/Bluetooth pairing button. They have a decent range although they perform a bit worse than typical Bluetooth headphones. Unfortunately, they have a fairly high latency performance which makes them not suitable for watching a lot of video content and gaming,

8.0 Bluetooth
Show Help
What it is: Bluetooth support for wireless headphones.
When it matters: To connect wirelessly to Bluetooth sources like your phone, tablet, console, PC and TV.
Score components:
  • 79% Multi-Device Pairing
  • 20% NFC
  • 0% PS4 Compatible
  • 0% Xbox One Compatible
Bluetooth Version : 4.2
Multi-Device Pairing
Show Help
What it is: A Bluetooth profile that's allows some headphones to be simultaneously connected to multiple Bluetooth sources.
When it matters: To quickly switch between your Bluetooth sources. For example switching from your phone to your home or work PC.
Good value: 2 devices.
:
No
NFC
Show Help
What it is: Near Field Communication technology that allows you to quickly, pair your headphones with your Bluetooth and NFC-enabled device.
When it matters: This makes pairing with an NFC-enabled device a lot easier than the typical and often tedious hold-to-pair procedure that most wireless headphones have.
Good value: Yes
:
Yes
PS4 Compatible
Show Help
What it is: Bluetooth compatibility with the PlayStation 4.
When it matters: To connect your headphones wirelessly with your PS4.
Good value: Audio + Microphone
:
No
Xbox One Compatible
Show Help
What it is: Bluetooth compatibility with the Xbox One.
When it matters: To connect your headphones wirelessly with your Xbox one.
Good value: Audio + Microphone
:
No

The WI-C400 have NFC support but do not have simultaneous multi-device pairing. On the upside, they are fairly easy to pair with a dedicated power/Bluetooth pairing button.

0 Wired
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What it is: The type and compatibility of audio cables for wired and wireless headphones.
When it matters: For all devices with a regular audio jack (line-out) and also compatibility of the in-line remote/boom microphone with consoles and Personal computers.
Score components:
  • 13% Analog
  • 9% USB
  • 26% PS4 Compatible
  • 26% Xbox One Compatible
  • 26% PC Compatible
Cable Tested : N/A
Analog
Show Help
What it is: A regular 1/8" TRS audio jack or a 1/4 or 1/16 TRS with a 1/8 TRS adapter.
When it matters: For all devices with a line out.
Good value: Yes
:
N/A
USB
Show Help
What it is: A USB or USB adapter to connect to your devices for audio and microphone.
When it matters: A digital USB adapter usually offers a slight advantages over a regular audio jack, like a DAC, and amplifier module or software support and compatibility with PCs. However it may not be as compatible with consoles.
Good value: Yes
:
N/A
PS4 Compatible
Show Help
What it is: PS4 compatibility with a regular 3 or 4 pin 1/8 TRS audio cable.
When it matters: When you want to use a wired headphone with your PS4
Good value: Audio + Microphone
:
N/A
Xbox One Compatible
Show Help
What it is: Xbox One compatibility with a regular 3 or 4 pin 1/8 TRS audio cable.
When it matters: When you want to use a wired headphone with your Xbox One
Good value: Audio + Microphone
:
N/A
PC Compatible
Show Help
What it is: PC compatibility with a regular 3 or 4 pin 1/8 TRS audio cable.
When it matters: When you want to use a wired headphone with your PC.
Good value: Audio + Microphone
:
N/A

They have no wired option. If you want a good sounding wired in-ear, check the 1More Triple Driver In-Ear.

0 Base/Dock
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What it is: The base station, dock or dongle transmitter of wireless headphones that receive data/audio via a proprietary frequency range.
When it matters: Knowing the inputs and outputs of the base/dock/dongle as well as its compatibility with consoles and Personal Computers. Also whether the base supports dock charging to easily recharge the headphones without any cables.
Score components:
  • 4% Optical Input
  • 22% Line In
  • 4% Line Out
  • 22% USB Input
  • 4% RCA Input
  • 9% PS4 Compatible
  • 9% Xbox One Compatible
  • 9% PC Compatible
  • 2% Power Supply
  • 13% Dock Charging
Wireless Type
Show Help
What it is: The type of wireless connection used by the base station/dock to communicate with the headphones.
When it matters: For latency and range. For example Radio frequency has low latency but mediocre range when obstructed and proprietary docks have their own 2.x GHz or 5 GHz frequency which varies in performance.
:
N/A
Optical Input
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What it is: Optical input for audio.
When it matters: Optical can carry a bit more data at faster speeds than typical wired connection which allows for more high quality, lossless audio.
Good value: Yes
:
N/A
Line In
Show Help
What it is: The regular wired input via a 1/8" TRS audio jack.
When it matters: For any device that has a line out for audio transmission.
Good value: Yes
:
N/A
Line Out
Show Help
What it is: A regular 1/8TRS audio jack output.
When it matters: If you need to share the audio source with other devices. A line out lets you connect other headphones or speakers to the dock/base station.
Good value: Yes
:
N/A
USB Input
Show Help
What it is: A digital USB input instead of a typical 1/8 TRS line-in.
When it matters: A USB connection can provide both an audio input and power to the Dock or Base station.
:
N/A
RCA Input
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What it is: Audio input using via an RCA connectors.
When it matters: Provides better stereo audio to the dock/base that's then transmitted to the headphones.
Good value: Yes
:
N/A
PS4 Compatible
Show Help
What it is: Dock/Base station compatibility with the PlayStation 4.
When it matters: To be able to use all the features of the dock/base station with out losing audio or microphone capability.
Good value: Audio + Microphone
:
N/A
Xbox One Compatible
Show Help
What it is: Dock/Base station compatibility with the Xbox One.
When it matters: To be able to use all the features of the dock/base station with out losing audio or microphone capability.
:
N/A
PC Compatible
Show Help
What it is: Dock/Base station compatibility with your Personal Computer.
When it matters: To be able to use all the features of the dock/base station with out losing audio or microphone capability.
Good value: Audio + Microphone
:
N/A
Power Supply
Show Help
What it is: The connector type of the power source.
When it matters: The accessibility of the power source. For example a power supply with USB/USB-C connects to multiple devices, PC , PS4, Xbox One or even with your regular phone charger whereas a A/C adapter is less common.
Good value: USB/USB-C
:
N/A
Dock Charging
Show Help
What it is: Charging the headphones via the dock/base station instead of a charging cable.
When it matters: It makes charging your headphones easier and gives you a sport to store your headphones when they are not in use.
Good value: Yes
:
N/A

These headphones do not have a dock. If you want a headphone that's versatile and has a dock, try the SteelSeries Arctis 7. However, it won't be as compact or portable.

6.9 Wireless Range
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What it is: Headphones that offer a cable-free listening experience over a wireless network, typically via Bluetooth or radio frequency.
When it matters: If you don't want to be limited by the length of an audio cable. This means having the freedom to move around in your home or office with a much greater range than an audio cable could provide, especially, if the Bluetooth source is heavy or difficult to carry.
Score components:
Obstructed Range
Show Help
What it is: The range that the wireless headphones can reach before dropping any audio when the Bluetooth source was placed in another room.
When it matters: If you can't or prefer not to carry your Bluetooth source on you, while listening to your audio in an indoor environment. Although, the obstructed wireless range will slightly depend on your home or office layout.
Good value: >35ft
Noticeable difference: 5ft
:
27 ft
Line of Sight Range
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What it is: The range that the wireless headphones can reach before dropping any audio when in direct line of sight of the Bluetooth device.
When it matters: If you can't or prefer not to carry your Bluetooth source on you, while listening to your audio in a large and open environment.
Good value: 170ft or more
Noticeable difference: 10ft
:
69 ft

These headphones have a decent wireless range but would not be ideal for large rooms or work environments with a lot of walls. They reached up to 27ft when the Bluetooth source was obstructed, which is just below average for most Bluetooth headphones. On the upside, they should have sufficient range for most activities especially if you keep your phone on you, but they won't be able to compete with headphones like the BeatsX or the U flex.

0.5 Latency
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What it is: How long it takes for audio to play through your headphones once the audio signal has been sent from a source.
When it matters: When gaming or watching movies. High latency means you will hear the audio much later than the images you see on screen.
Score components:
Default Latency
Show Help
What it is: The Base RF latency or the default sub-band coding (SBC) of most Bluetooth headphones.
When it matters: When watching videos a high latency can cause sync issues between the images you see and the audio you hear.
Good value: 50ms or less
Noticeable difference: 15ms
:
239 ms
aptX Latency
Show Help
What it is: An audio coding algorithm (Codec) that improves bit rate efficiency. It reduces latency and improves sound quality over Bluetooth.
When it matters: For better sound quality if your often streaming music over Bluetooth. Also it slightly improves latency when watching videos with wireless headphones.
Good value: 50ms or less
Noticeable difference: 15ms
:
N/A
aptX(LL) Latency
Show Help
What it is: Low latency variation of aptX that significantly reduces sync issues between video and sound when using Bluetooth headphones.
When it matters: When watching videos or gaming latency is a lot more noticeable than just listening to music.
Good value: 50ms or less
Noticeable difference: 5ms
:
N/A

The WI-C400 have quite a bit of latency which is not suitable for watching a lot of video content. They perform a bit worse than typical Bluetooth headphones and have no wired option so they won't be the best headphones for gaming or watching movies.

In the box

Sony WI-C400 In the box Picture

  • SOny WI-C400 Headphones
  • USB cable
  • Earbud Tips (x3)
  • Manual

Compared to other Headphones

Sony WI-C400 Compare Picture

The Sony WI-C400 are average around-the-neck, in-ears with a long-lasting battery life and a decently comfortable design that you can use for sports. They're also decently flexible and lightweight but do not have the build quality of some o the other around-the-neck headphones we've tested. They have a mediocre sound quality, they lack a bit of bass and can sound slightly piercing on some tracks. They also take a considerably long time to charge and have a high amount of latency which is not suitable for gaming or watching videos. 

Samsung U Flex

The Samsung U Flex, like the WI-C400, are easy-to-use and decently comfortable. They have a more flexible around-the-neck design that can fit into some pockets, but the neckband is a bit bulkier overall. On the upside, they sound better than the Sonys and are a bit more suitable for more use cases. They also benefit from the Samsung Level app when using a Samsung device which offers a lot more customization options than the WI-C400. The U Flex are cheaper and perform better overall but if need a longer battery life, then the Sonys could be a decent option.

Beats BeatsX

The BeatsX are versatile headphones with a good sound. Their audio reproduction is a lot better than the Sony WI-C400 and their design and performance is better suited for more use cases. They have a more flexible and portable design, that you can easily fit into your pockets, and a greater wireless range. They also have less latency, especially when using them with an iOS device. They are a considerably better around-the-neck in-ears than the Sonys, but they're also pricer so if you're on a tight budget, the WI-C400 could be a decent alternative.

Bose QuietControl 30

The Bose QuietControl 30 are slightly bulkier, around-the-neck headphones than the WI-C400. However, they're more comfortable thanks to their earbud fit and they're also noise canceling headphones so they are better-suited for commuting and traveling. They also sound considerably better but they're not as flexible, which coupled with their bulkier size makes them a bit less portable than the Sonys. On the upside, they are better in almost every category when compared to the WI-C400 but they're also considerably more expensive.

Mpow Jaws

The Mpow Jaws are budget around-the-neck wireless in-ears with a better sound than the WI-C400 sound but a worse, cheaper build quality. They perform well for most use cases and have a comfortable in-ear fit but they have a slightly bulkier design than the Sonys. They're a bit cheaper than the Sony's with a slightly better performance overall but if you need a longer battery life and do not like the design of the Mpow Jaws, then the WI-C400 are a good alternative.

Conclusion

6.3Mixed Usage
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What it is This is the combination of the different use cases to evaluate how versatile the headphones are. Therefore an everyday headphone should be well-rounded enough to adapt to most situations and environments without significant losses in sound quality, design ergonomics or isolation.
Score components:
Average for mixed usage. The Sony WI-C400 have a decently comfortable and lightweight design that's stable enough to run with. They also have a long battery life for continuous use. Unfortunately, they have a mediocre-at-best sound quality. They do not isolate as well as other in-ears and take a long time to charge. They also have quite a bit of latency which is not suitable for gaming or watching a lot of videos.
6.2Critical Listening
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What it is The level of audio fidelity a headphone can reproduce. Therefore a balanced and true representation of bass, mids, treble, soundstage and imaging, as well as a comfortable listening experience, is essential for critical listening.
Score components:
Mediocre for critical listening. They have a good mid-range but can sound a bit too forward and piercing on already bright tracks. They also have a lackluster bass range that's missing a lot of thump and rumble so they may sound a bit bland and boring to some. Unfortunately, they are closed-back in-ears so they can't create a spacious and open soundstage which won't be ideal for critical listeners.
6.6Commute/Travel
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What it is How well the headphones handle the loud environments involved in commuting or traveling. Therefore your listening experience should be comfortable, hassle-free and as isolated from noise as possible.
Score components:
Average for commuting. They do not block a lot of noise but they're decently portable, comfortable and fairly easy to use. You can also mask some of the ambient chatter of your commute by raising the volume level since they barely leak.
7.2Sports/Fitness
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What it is How well-adapted the headphones are, to use while doing sports or strenuous exercise. Therefore the headphones should not be too cumbersome and deliver a stable and comfortable listening experience.
Score components:
Above-average for sports. The WI-C400 are easy-to-use and have an around-the-neck, in-ear design that's stable enough for running. They're also lightweight, decently portable, and wireless. However, the in-ear tips do slide a bit in the ear canal during more strenuous activities.
6.6Office
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What it is How well the headphones can deliver a comfortable and isolated listening experience in an office-like environment. They should not leak much and should block the noise of a busy office.
Score components:
Average for office use. The Sony WI-C400 struggle to isolate in loud environments but have very low leakage which won't distract your colleagues. They also have a long battery life and an intuitive control scheme.
4.8Home Theater
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Score components:
Sub-par for home theater use. They're decently comfortable but have a mediocre sound and too much latency for watching a lot of video content. They're also Bluetooth-only headphones so they have no other connection option to reduce the latency when watching movies.
4.5Gaming
Show Help
Score components:
Below-average for gaming. They have too much latency for gaming and a mediocre-at-best microphone and sound quality. They also do not support the Sony| Headphones Connect app so they have no customization options which are typical for a gaming headset.
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