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Reviewed on Jun 28, 2018 , Marc Henney, Jean-Christophe Lamontagne

HiFiMan HE-400i
HEADPHONES REVIEW

Usage Ratings - Version 1.2

Test Benches: test

  • 1.2: Winter 2018
  • 1.1: Summer 2017
  • 1.0: Winter 2017
  • 0.9: Winter 2016
5.8
Mixed Usage
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:
8.0
Critical Listening
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:
4.4
Commute/Travel
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:
5.2
Sports/Fitness
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:
5.1
Office
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:
5.9
Home Theater
Score components:
5.9
Gaming
Score components:
Type : Over-ear
Enclosure : Open-Back
Wireless : No
Noise-Cancelling : No
Mic : No
Transducer : Planar Magnetic

The HiFiMan HE-400i are great critical listening headphones that are not really suitable for any other use case. They're comfortable and deliver an excellent sounding audio reproduction. However, they can sound a bit sharp on already bright tracks, and they do not have as much bass as the Edition X. They also have fairly weak hinges that are not very durable, unlike the HiFiMan Sundara, and may be a deal breaker for most critical listeners.

Test Results
Design 6.2
Sound 8.2
Isolation 1.7
Microphone 0
Active Features 0
Connectivity 4.8
Pros
  • Great sound quality.
  • Decent build quality.
  • Comfortable.
Cons
  • Sensitive to ambient noise, by design.
  • Big and bulky.
  • High leakage by design, cannot be used in public.
Update 2/16/2018: Converted to Test Bench 1.2.
Update 8/10/2017: Converted to Test Bench 1.1. Learn more about our new versioned test bench system here.

Check Price

6.2

Design

Score components:
HiFiMan HE-400i Design Picture

The HiFiMan HE-400i are decently well-built reference headphones. They have a lightweight, metallic frame that makes the headband feel sturdy. They're also comfortable to wear for long periods of time. Unfortunately, their build quality has a few flaws, especially at the hinges, where they are prone to breaking under moderate physical stress. Also, they are big, bulky critical listening headphones, not meant to be used outdoors or while doing any kind of physical activity.

Style
HiFiMan HE-400i Design Picture 2

The large and open ear cups of have a metallic finish and a slight blue tint that's eye-catching. That coupled with the soft suede padding and the old school leather headband give them a retro, yet premium appeal that will work for some. They do not look as premium as the Sundara and they're a bit too bulky to wear out in public, but they're not designed for outdoors so it shouldn't be too much of an issue.

8.0 Comfort
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
HiFiMan HE-400i Comfort Picture
Weight : 0.81 lbs
Clamping Force
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.
:
1.12 lbs

The HiFiMan HE-400i are comfortable, well-padded headphones. They're a bit tight on the head, but the suede-like material used for the padding is soft and pleasant on the skin. The ear cups are not as large as the Edition X, and the padding touches the tips of some listeners'ears. However, this smaller format might be more comfortable for some than the oversized ear cups of the more premium model.

0 Controls
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.
Ease of use : N/A
Feedback : N/A
Call/Music Control : No
Volume Control : No
Microphone Control : N/A
Channel Mixing
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 : N/A

These headphones do not have any controls.

6.2 Breathability
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:
HiFiMan HE-400i Breathability After Picture
Avg.Temp.Difference : 6.4 C

The HiFiMan HE-400i, like the rest of the planar magnetic HifiMan headphones, are not very breathable. They have an open back design which usually does not get as hot as closed back over-ears. Unfortunately, since they are planar magnetic headphones, the larger drivers obstruct a good amount of airflow, so they will make your ears fairly warm after a couple of hours of continuous listening. You will have to take breaks if you have long continuous listening sessions when compared to some other over-ears like the Sennheiser HD 700.

5.3 Portability
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:
HiFiMan HE-400i Portability Picture
L : 8.27 "
W : 7.09 "
H : 4.13 "
Volume : 235.44 Cu. Inches
Stand required : N/A

The HiFiMan HE-400i are big and not portable. They're a bit too cumbersome to comfortably carry on your person and do not fold into a more compact format. The ear cups lay flat but are bigger than average over-ear models, which doesn't save much space. On the upside, they are a little smaller than the Edition X, but you will still need a backpack or a large bag to transport these headphones. Also, they don't come with a protective case or pouch.

0 Case
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 : No case
L : N/A
W : N/A
H : N/A
Volume : N/A

These headphones do not come with a case.

7.0 Build Quality
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
HiFiMan HE-400i Build Quality Picture

The HiFiMan HE-400i have a good build quality. They make use of premium materials, which results in a sturdy design that can handle a fair amount of physical stress. The ear cups are not as well-built as the Edition X's ear cups. However, the plastic joints connecting the frame to the ear cups is thicker and sturdier, which makes these headphones slightly more durable.

Update 12/04/2018: Multiple users have experienced a build quality defect, resulting in broken hinges/yokes under mild stress. We have therefore adjusted our build quality score to reflect this manufacturing issue.

6.0 Stability
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
HiFiMan HE-400i Stability Picture

These are not sports headphones. The large over-ear cups will sway and quickly slip off your ears if used during exercise or while running. They're a bit more stable than the Edition X and will maintain their position during casual or critical listening sessions.

Cable
HiFiMan HE-400i Cable Picture
Detachable : Yes
Length : 10 ft
Connection : 1/8" TRS

They come with a 1/8" TRS audio cable.

Top
Headshots 1
Headshots 2
8.2

Sound

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.)
HiFiMan HE-400i Frequency Response

The HiFiMan HE-400i is a very good sounding pair of open-back over-ear headphones. They have a consistent, punchy, and well-balanced bass, a nearly flawless mid-range, and a very good treble. They also have exceptional imaging, and a soundstage that outperforms most of the headphones we have measured so far. Overall they have a well-balanced and versatile sound and would be a great choice for a wide range of genres, especially vocal-centric music. However, because of their lack of sub-bass and slightly sharp treble, they may not be ideal for the fans of bass-heavy genres. Their upgrade, the Hifiman Sundara, are slightly less bright sounding and produce less distortion.

7.9 Bass
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:
HiFiMan HE-400i Bass
Std. Err.
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
:
2.61 dB
Low-Frequency Extension
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
:
54.17 Hz
Low-Bass
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
:
-5.17 dB
Mid-Bass
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
:
-1.11 dB
High-Bass
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
:
1.15 dB

The bass of the HE-400i is very good. The LFE (low-frequency extension) of 54Hz is decent, but not great. Also, low-bass which is responsible for the thump and rumble common to bass-heavy music is lacking by more than 5dB. So their sub-bass may not be heavy enough for the fans of heavy bass. Mid-bass, responsible for the body of bass guitars and the punch of kick drums, is also lacking by about 1dB, but this effect will be very subtle. High-bass, responsible for warmth is quite flat and over our neutral target by just 1dB.

8.7 Mid
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:
HiFiMan HE-400i Mid
Std. Err.
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
:
1.72 dB
Low-Mid
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
:
2.09 dB
Mid-Mid
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
:
1.85 dB
High-Mid
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
:
0.59 dB

The mid-range is great. The response is flat throughout the range, which indicates a well-balanced reproduction of vocals and lead instruments. But low-mid and mid-mid are above our target by about 2dB. This thickens the body of vocals and lead instruments a bit, however, it won't be noticeable to most people. High-bass is within 0.6dB of our neutral target, which is great.

8.2 Treble
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:
HiFiMan HE-400i Treble
Std. Err.
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
:
3.29 dB
Low-Treble
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
:
1.21 dB
Mid-Treble
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
:
3.07 dB
High-Treble
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
:
-1.02 dB

The treble performance is very good. Low-treble is relatively even and flat. It is overemphasized by just 1.2dB, which won't be very noticeable. However, the +5dB bump in the sibilance range (6KHz-10KHz) makes the S and T sounds, mostly heard on vocals and cymbals, a bit bright and piercing, especially on overly bright tracks. The newer HiFiMan Sundara have a slightly better balanced sibilance range.

Raw Frequency Response
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:
8.1 Frequency Response Consistency
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:
HiFiMan HE-400i Consistency L HiFiMan HE-400i Consistency R
Avg. Std. Deviation
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
:
0.38 dB

The HiFiMan HE-400i have a great frequency response consistency. The maximum amount of deviation across our five human subjects is less than 3dB at 20Hz, but the deviation happens across a very narrow range and the rest of the bass region is exceptionally consistent. The treble delivery is also very consistent across multiple re-seat, with the maximum deviation below 10KHz being less than 2dB.

8.8 Imaging
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.
HiFiMan HE-400i Group Delay HiFiMan HE-400i Phase Response
Weighted Group Delay
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
:
0.15
Weighted Amplitude Mismatch
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
:
0.44
Weighted Frequency Mismatch
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
:
1.12
Weighted Phase Mismatch
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
:
7.77

The imaging performance is great. Weighted group delay is at 0.15, which is very good. The GD graph also shows that the entire group delay response is below the audibility threshold. This ensures a tight bass and a transparent treble reproduction. Additionally, the L/R drivers of our test unit were very well-matched in frequency, amplitude, and phase response, ensuring accurate placement and localization of objects (voices, instruments, and video game effects) in the stereo image.

7.9 Soundstage
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.
HiFiMan HE-400i PRTF
PRTF Accuracy (Std. Dev.)
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
:
3.4 dB
PRTF Size (Avg.)
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
:
5.43 dB
PRTF Distance
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
:
13.65 dB
Openness
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
:
9.2
Acoustic Space Excitation
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
:
9.3
Correlated Crosstalk
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
:
-0.42 dB

The soundstage performance of the HE-400i is good. The PRTF graph shows a good amount of accuracy, and a decent amount of pinna interaction/activation. However, the notch around the 10KHz region is not very accurate or deep, which suggests a soundstage that is relatively natural and large but located inside the listener's head. Also, because of their very open enclosure, their soundstage will be perceived to be more open than that of closed-back headphones.

7.9 Total Harmonic Distortion
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:
HiFiMan HE-400i Distortion
Weighted THD @ 90
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
:
0.421
Weighted THD @ 100
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
:
3.22

The HiFiMan HE-400i have a good harmonic distortion performance. The amount of THD produced in the bass range is within very good limits, and it doesn't rise dramatically under heavier loads either. However, the mid and treble ranges show elevated levels of THD which could make the sound of these regions a bit impure and harsh. Their upgrade, the HifiMan Sundara, have an improved THD performance but this won't be audible to most people.

1.7

Isolation

Score components:

The open-back design of HiFiMan HE-400i is purposely meant to leak and poorly isolate listeners. This improves the sound quality by creating a wide and immersive soundstage but this also means, the headphones cannot be used outside effectively. They will most likely distract anyone around you with their leakage level and they will be practically unusable in loud environments.  

2.3 Noise Isolation
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:
HiFiMan HE-400i Noise Isolation
Isolation Audio
What it is: The simulated noise isolation of the headphones, demonstrating how much outside noise is blocked out by putting the headphones on. This recording is created using an EQ and is not an actual recording. For headphones with ANC (active noise cancellation), the playback simulates the isolation with ANC enabled.
When it matters: When the headphones are going to be used in a noisy envinronment (airplane, subway, etc.)
:
Overall Attenuation
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
:
-1.61 dB
Bass
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
:
-0.21 dB
Mid
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
:
1.08 dB
Treble
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
:
-5.43 dB
Self-Noise
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
:
0 dB

The HiFiMan HE-400i have a poor isolation. The architecture of these headphones is completely open, and therefore block very little noise. In the bass range, where the rumble of airplane and bus engines sits, they don't achieve any isolation. In the mid-range, which is important for blocking out speech, they don't isolate at all either. In the treble range, occupied by sharp sounds like S and Ts, they achieve about 5dB of isolation, which is barely noticeable.

0.7 Leakage
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:
HiFiMan HE-400i Leakage
Leakage Audio
What it is: The simulated sound leakage heard 1 foot away from the user, while the user is listening to a 100dB SPL signal. This recording is created using an EQ and is not an actual recording.
When it matters: When you don't want people hear what you are listening to.
:
Overall Leakage @ 1ft
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
:
67.38 dB

The HiFiMan HE-400i have a poor leakage performance. These are the one of the loudest and leakiest headphones we have measured so far. Not only the level of the leakage is extremely high, the profile is extremely broad too. Most headphones either level off at higher frequencies, or roll-off, but similar to the Edition X and Sundara, the HE-400i keeps getting louder as the frequency rises. The significant portion of their leakage is between 300Hz and 20KHz. In terms of loudness, with the music at 100dB SPL, the leakage at 1 foot away averages at 67dB SPL and peaks at 86dB SPL, which is a lot louder than the noise floor of an average office.

0

Microphone

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
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
:
N/A
In-line
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
:
N/A
Boom
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
:
N/A
Detachable Boom
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 HiFiMan HE-400i do not come with a microphone. For a wired headphone with a good in-line microphone, check out the Bose SoundTrue Around-Ear II, the QuietComfort 25 or the Apple EarPods.

0 Recording Quality
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:
Recorded Speech
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.
:
N/A
LFE
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
:
N/A
FR Std. Dev.
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
:
N/A
HFE
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
:
N/A
Weighted THD
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
:
N/A
Gain
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
:
N/A

These headphones do not have a microphone so the recording quality has not been tested.

0 Noise Handling
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:
Speech + Pink Noise : N/A
Speech + Subway Noise : N/A
SpNR
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
:
N/A

The HE400i do not have a microphone so the noise handling has not been tested.

0

Active Features

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 HiFiMan 400i are passive critical listening headphones with no battery or app support.

N/A Battery
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
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.
:
N/A
Battery Life
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
:
N/A
Charge Time
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
:
N/A
Power Saving Feature
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.
:
N/A
Audio while charging
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.
:
N/A
Passive Playback
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.
:
N/A

These headphones do not have any active components and do not require a battery.

0 App Support
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
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
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 : N/A
Room effects
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
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

These headphones do not come with an app or software for added customization options.

4.8

Connectivity

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
  • 33% Wired
  • 10% Base/Dock
  • 22% Wireless Range
  • 25% Latency

The HiFiMan HE-400i have a simple 1/8"TRS audio cable with no in-line remote. They will only provide audio when connected to your console or PC and have practically no latency since they are wired. However, this also means that they will not have the range and convenience of wireless headsets when gaming.

0 Bluetooth
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:
  • 80% Multi-Device Pairing
  • 20% NFC
  • <1% PS4 Compatible
  • <1% Xbox One Compatible
Bluetooth Version : N/A
Multi-Device Pairing
What it is: A Bluetooth profile that allows some headphones to be simultaneously connected to multiple Bluetooth sources, and have full call and media support on both/all devices they are connected to.
When it matters: To quickly switch between your Bluetooth sources. For example, switching from your phone to your home or work PC and still have call and media support on both devices.
Good value: 2 devices.
:
N/A
NFC
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
:
N/A
PS4 Compatible
What it is: Bluetooth compatibility with the PlayStation 4.
When it matters: To connect your headphones wirelessly with your PS4.
Good value: Audio + Microphone
:
N/A
Xbox One Compatible
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
:
N/A

These headphones are wired and do not have a Bluetooth connection. If you want a good-sounding wireless headset, then consider the Bose QuietComfort 35 II.

7.2 Wired
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 : Not OS specific
Analog
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
:
Yes
USB
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
:
No
PS4 Compatible
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
:
Audio Only
Xbox One Compatible
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
:
Audio Only
PC Compatible
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
:
Audio Only

The HiFiMan HE-400i, like the Sundara, have a simple 1/8TRS audio cable with no in-line remote/microphone. They will only provide audio when connected to your PS4, Xbox One or PC.

0 Base/Dock
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:
  • 5% Optical Input
  • 22% Line In
  • 5% 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
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
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
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
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
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
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
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
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
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
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
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

The HiFiMan HE 400i do not have a dock. If you need a headset with a dock that also has a wired connection for gaming or watching movies, then consider the SteelSeries Arctis 7.

0 Wireless Range
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
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
:
N/A
Line of Sight Range
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
:
N/A

These headphones do not have a wireless range since they only connect via a regular audio cable with an in-line remote.

10 Latency
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
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
:
0 ms
aptX Latency
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
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 wired connection of these headphones has negligible latency which is suitable for gaming and home-theater use. Unfortunately, they will not have the range and convenience of wireless headsets

In the box

HiFiMan HE-400i In the box Picture

  •  HiFiMan HE-400i Headphones
  • 1/8" to 1/4" adapter
  • Audio cable
  • Manual

Compared to other Headphones

HiFiMan HE-400i Compare Picture

The Hifiman HE-400i are great-sounding headphones with a comfortable fit and a balanced audio reproduction. They're a good choice for critical listening but will not be as good for other use cases. Unfortunately, their build quality, though premium looking is a bit fragile and weak at the hinges. This may be a deal breaker for some, especially since similarly designed models, like the ones compared below, have an equally as good sound but a better build quality.

Sennheiser HD 650

The Sennheiser HD 650 are slightly worse for critical listening than the HiFiMan HE-400i. The Sennheiser have a slightly more durable build quality, and they do not make your ears as hot since their dynamic drivers do not obstruct airflow like the planar magnetic ones of the Hifiman. Also, the Sennheiser have an iconic sound profile which some may prefer over that of the HE-400i but have a much smaller soundstage. The Hifiman, in this case, have a more immersive sound quality. They also have a better bass delivery and more comfortable design that you can wear for longer. The fragile build of the HE-400i makes them hard to recommend, but overall, they are better sounding and more comfortable than the Sennheisers.

HiFiMan Sundara

The Hifiman Sundara are a better built and better sounding critical listening headphone than the Hifiman  HE-400i. The Sundara have much better build quality than that of the HE-400i which makes them a bit more durable although they are still prone to a few defects due to the mediocre overall quality control from Hifiman. The HE-400i, on the other hand, are a bit more comfortable to wear since the ear cups swivel to better adjust to the contours of your head, which isn't the case with the Sundaras. On the upside, the Sundara are a definite upgrade to the HE-400i and would be the better headphone for critical listening.

Beyerdynamic DT 770

The Beyerdynamic DT 770 are a slightly worse sounding critical listening headphone than the Hifiman He-400i mostly due to their closed back design and weaker soundstage. On the upside, they have a much more durable design, and since they have closed back ear cups, you can use them outdoors which makes them a much better mixed-usage option than the HiFiMan. They also have a better bass range which some may prefer. The DT 770 are a better headphone overall compared to the HE 400i. However, if you only care about sound, the more spacious soundstage of the HE-400 may make them the better alternative for you.

AKG K712 PRO

The AKG K 712 Pro have a similar performance for critical listening as the HE-400i but they're comfortable. They also come with more accessories and their headband design despite having more moving parts is a bit more durable than the Hifiman's. On the upside, the HifiMan HE-400i are still fairly comfortable headphones and their design feels a bit more premium. They also have planar magnetic drivers that create a more spacious soundstage but it also makes them a bit warmer to wear for long listening sessions. Soundwise, the HE-400i have the slight edge but if you want the more comfortable headset, get the AKGs instead.

Conclusion
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5.8Mixed Usage
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:
Mediocre for mixed usage. The HiFiMan HE-400i are critical listening headphones, not intended for other use cases except maybe home theater. They deliver an great sound quality and comfortable design but have poor isolation and a bulky, cumbersome build. They are best used at home and in isolation and will not be suitable for commuting or sports.
8.0Critical Listening
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:
The HE-400i are good reference headphones that shine in the sound department. They're comfortable for long listening sessions and deliver an excellent representation of instruments and vocals. They sound a little sharp and bass is a bit lacking compared to the Edition X, but their sound is sufficiently balanced and open to please most critical listeners.
4.4Commute/Travel
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:
Not designed for commuting. The open ear cups do not block any noise, which is not ideal for loud environments.
5.2Sports/Fitness
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:
Not meant for sports. They're big, bulky and slightly unstable. Even if they can be powered by a mobile device these headphones perform poorly outdoors and will fall if used during physical activity.
5.1Office
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:
Sub-par for office use. They will not block the office chatter and also leak a lot. Unless you work in an isolated environment, anyone will be able to hear your audio.
5.9Home Theater
Score components:
Mediocre for home theater. These headphones are comfortable headphones with a great and open sound quality. They also have no latency since they're wired. However, they're limited by the range of their 10ft audio cable which is longer than most but may not be long enough for all home theater setups.
5.9Gaming
Score components:
Mediocre for gaming. The HiFiMan HE-400i are comfortable, they sound great and have a low latency wired design. However, they do not have a microphone for voice chat when gaming, and no customization options which are typical for most gaming headsets. Also, they do not have the convenience of wireless design or multiple connection options for an optimized experience on Xbox one or PS4.

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