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Usage Ratings - Version 1.2
Mixed Usage
Critical Listening
Type : In-ear
Enclosure : Closed-Back
Wireless : Truly Wireless
Noise-Cancelling : No
Mic : Yes
Transducer : Dynamic

The xFyro xS2 are decent mixed usage truly wireless in-ears with a few flaws. They are decently comfortable, but the in-ear fit might not be for everyone. They’re very portable and have a good isolation performance, making them versatile for commute and everyday casual use. They also have a nice case that feels premium, but unfortunately, it doesn’t really protect the headphones and acts more as a power bank. Their sound quality is average-at-best and our unit had a frequency response mismatch. Additionally, you must connect the right earbud first or you’ll have inverted audio channels, which is frustrating. On the upside, they have great wireless range and are stable enough for running if you can find a good fit with the provided tip options.

Test Results
Design 7.4
Sound 6.3
Isolation 8.3
Microphone 5.9
Active Features 5.1
Connectivity 2.9
  • Good isolation performance.
  • Minimal leakage.
  • Sub-par battery life.
  • Mediocre audio reproduction.
  • Hard to set up.

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The xFyro xS2 are truly wireless closed-back in-ears that have a decent build quality and are supposedly fully waterproof for 30 minutes at a depth of 3 feet (but we do not have a test for it currently). However, note there are reports that Bluetooth signal doesn’t work well underwater, so you can’t use them for swimming. They have a typical in-ear fit and enter the ear canal which isn’t the most comfortable for everyone. On top of this, their control scheme forces you to push the buds even further in to register commands. They come with a very well-made 850mAh charging case that acts as a power bank, but unfortunately, it doesn’t really protect the headphones. On the upside, you get additional charges for the headphones, and they are also stable enough for some light physical activity.  


The xFyro xS2 are truly wireless in-ears that have a low-profile look, but a slightly bulky earbud design. They protrude quite a bit out of the ear while wearing them. They have a decent finish and don’t feel too cheap. Their included aluminum case also has a nice style and high-end finish. These headphones come in three different color variants: black, blue and red.

7.0 Comfort
Weight : 0.02 lbs
Clamping Force
0 lbs

The xS2 feel like typical in-ears, and the fit might not be as comfortable for everyone. They enter your ear canal deeply which could be bothersome for some, but come with three different ear tip options to help you find the most comfortable fit. They are very lightweight headphones, and you don’t feel them too much when plugged into your ears. However, their control scheme forces you to push the earbud even further in your ear to register an action, which is uncomfortable.

5.3 Controls
Ease of use : Mediocre
Feedback : Good
Call/Music Control : Yes
Volume Control : No
Microphone Control : No
Channel Mixing
Noise Canceling Control : N/A
Additional Buttons : No

The control scheme of the xS2 is disappointing. While the buttons on both earbuds are clicky and offer good feedback, they aren’t easy to use. Every functionality needs you to push the earbud further inside your ear, which hurts. They also don’t have any volume control and only offer call/music management and track skipping (forward and backward).

9.2 Breathability
Avg.Temp.Difference : 0.8 C

Like most in-ears, the xFyro xS2 are very breathable since they don’t trap heat under an ear cup. You shouldn’t notice the difference in temperature and shouldn’t sweat more while using them during physical activity, which is nice.

9.5 Portability
L : 1.2 "
W : 1.2 "
H : 0.7 "
Volume : 1.0 Cu. Inches
Transmitter required : N/A

Like most in-ears, these headphones are very portable due to their very small design. They can easily fit in a pocket or bag and are easy to keep on you at all times. They also come with a case, which adds slight bulk, but it will still fit in pockets.

7.0 Case
Type : Hard case
L : 4.2 "
W : 1.1 "
H : 0.9 "
Volume : 4.2 Cu. Inches

The xFyro xS2 come with a decent solid case. However, the casing doesn’t really protect the headphones as the top of the buds is exposed. Also, only magnetic force is holding the headphones in place, meaning that quick motion or impacts will make the headphones fall out of their receptacle. On the upside, the case also acts as an 850mAh rechargeable power bank, in which you can plug a USB cable to charge other devices.

7.0 Build Quality

The xFyro xS2 are decently-built headphones. The buds are made out of dense plastic and feel solid enough to survive a few impacts. The aluminum case is also very well-made and feels heavy and solid. They are also rated IP67 for great dust and water resistance. They can technically be submerged by water for 30 minutes at a depth of 3 feet but note that Bluetooth may not work as well underwater. They can be used in the shower or if it’s raining according to the manufacturer, but we do not have a test in our current test bench to measure this accurately.

7.0 Stability

These headphones are fairly stable if you can find the right tip size for you. You’ll be able to jog with them or wear them at the gym, but they won’t be ideal for more intense physical activity. They are very lightweight, and their truly wireless design eliminates the risk of a cable getting stuck on something and yanking the headphones out of your ears. However, they do not have stability fins in order to help them to stay in place for more intense sports.

Detachable : N/A
Length : N/A
Connection : N/A

These truly wireless headphones don’t have a cable but come with a USB to micro-USB charging cable.

Headshots 1
Headshots 2


The xFyro xS2 are mediocre sounding truly wireless closed-back in-ears. These headphones have decent bass and treble ranges, as well as a good mid-range. However, they lack low-bass which results in a lack of thump and rumble. High-bass and low-mid are also overemphasized and make the mix boomy and cluttered, especially on vocals on lead instruments. Their treble is also slightly uneven, meaning leads will lack detail and some sibilances are slightly overemphasized. Overall, they are not the best sounding headphones, especially for vocal-centric music, but they may do better for bass-heavy genres. 

Our unit also had a frequency response mismatch. It is also important to note that you need to power up and connect the right earbud first, or your channels will be inverted, and you’ll hear the right channel in the left bud, and vice-versa.

7.2 Bass
Std. Err.
3.51 dB
Low-Frequency Extension
62.59 Hz
-2.96 dB
0.58 dB
5.03 dB

Decent bass range performance. LFE is at 63Hz, which is below average. Low-bass, which is responsible for low-end thump and rumble, is lacking by about 3dB. While mid-bass is fairly close to our target curve, high-bass is overemphasized by over 5dB, making the bass sound muddy and boomy.

7.6 Mid
Std. Err.
3.15 dB
4.17 dB
-0.66 dB
-2.31 dB

The xS2’s mid-range performance is good. The range is fairly even and flat, but there’s an 8dB tilt favoring lower frequencies, making vocals and lead instruments sound thick and cluttered.

7.1 Treble
Std. Err.
4.23 dB
-2.62 dB
1.88 dB
-0.65 dB

The treble performance is decent. The range is slightly uneven, and most of it is underemphasized. This results in lead instruments lacking detail and brightness. Also, the mid-treble is a bit uneven and over our target curve by about 2dB, which emphasizes some sibilances while others will lack presence.

9.0 Frequency Response Consistency
Avg. Std. Deviation
0.21 dB

The frequency response consistency is excellent. If the user can 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.

8.3 Imaging
Weighted Group Delay
Weighted Amplitude Mismatch
Weighted Frequency Mismatch
Weighted Phase Mismatch

The stereo imaging is excellent. Their weighted group delay is at 0.14, which is very low. The group delay graph also shows that the entire response is well below the audibility threshold. This ensures a tight bass and a transparent treble reproduction. Also, the L/R drivers of our test unit were well-matched in amplitude and phase response, but they were not in frequency response. This won't have a negative effect on the accurate placement and localization of objects (voices, instruments, video games effects) in the stereo image, but it will create unevenness and holes in the stereo field. These results are only valid for our unit, and yours may differ.

1.0 Soundstage
PRTF Accuracy (Std. Dev.)
PRTF Size (Avg.)
PRTF Distance
Acoustic Space Excitation
Correlated Crosstalk
0.0 dB

The soundstage is poor. This is because creating an out-of-head and speaker-like soundstage is largely dependent on activating the resonances of the pinna (outer ear). The design of in-ears and earbuds is in such a way that fully bypasses the pinna and doesn't interact with it. Also, because these headphones have a closed-back enclosure, their soundstage won't be perceived to be as open as that of open-back earbuds like the Apple AirPods, Google Pixel Buds, or the Bose SoundSport Free.

7.7 Total Harmonic Distortion
Weighted THD @ 90
Weighted THD @ 100

The xFyro xS2 have a good harmonic distortion performance. In the bass range, they show little THD, even under heavy loads. However, the peaks in THD at 1.2KHz may add a bit of harshness to the sound of those frequencies. There is also no big jump in THD at heavier loads, which is most likely due to the increased flexibility of the driver at 100dB SPL.



The xFyro xS2 passively isolate better than some noise-canceling headphones we've tested so far. Their in-ear fit goes deep into the ear canal which creates a good seal that does not leak and blocks a good amount of noise. Also, since they barely leak, you can mask even more noise by playing your music at higher volumes without distracting the people around you. This makes them a great choice for noise sensitive environments like being at the office, and for loud, noisy conditions like being on a plane or commuting.

7.5 Noise Isolation
Isolation Audio
Overall Attenuation
-24.55 dB
-13.02 dB
-20.17 dB
-40.95 dB
22.11 dB

Their isolation performance is good (see our recommendations for the best noise cancelling earbuds). Despite lacking active noise cancelation, they passively isolate a good amount of ambient noise. They achieve about 13dB of isolation in the bass range, where engine rumbles sit, which is above-average. In the mid and treble ranges, they reduce the outside noise by 20dB and 41dB respectively, both values being very good.

10 Leakage
Leakage Audio
Overall Leakage @ 1ft
20.87 dB

The leakage performance is excellent. The xFyro xS2 basically do not leak, so there's no need to worry about disturbing people around with your music, even if you listen at very loud volumes. With the music at 100dB SPL, the leakage at 1 foot away averages at 21dB SPL and peaks at 33dB SPL, which is roughly as loud as a very calm room.



Detachable Boom

The integrated microphone has a sub-par quality. In quiet environments, speech recorded or transmitted with this mic will sound noticeably thin, quite muffled and lacking in detail. However, it will still be understandable. In noisy environments, the mic will struggle to separate speech from background noise even in moderately loud situations, like a busy street.

5.8 Recording Quality
Recorded Speech
273.0 Hz
FR Std. Dev.
3.76 dB
2416.32 Hz
Weighted THD
33.06 dB

The xS2’s microphone has a sub-par recording quality. The LFE (low-frequency extension) of 273Hz means speech recorded or transmitted will sound noticeably thin. The HFE (high-frequency extension) of 2.4KHz is poor and results in speech that is muffled and lacking in detail. It also negatively affects the intelligibility of speech but will still be understandable in very quiet environments.

5.9 Noise Handling
Speech + Pink Noise :
Speech + Subway Noise :
10.24 dB

The integrated mic is sub-par at noise-handling. In our SpNR test, they achieved a speech-to-noise ratio of 10dB, indicating they are best suited for quiet environments and will struggle to separate speech from ambient noise in moderate and loud situations.


Active Features

The xFyro xS2 have a sub-par battery life with slightly above 3.3 hours of playback on one charge. However, thanks to the charging case, they get additional battery life. They advertised 5 hours for one charge, so we also expect the 30-hour of continuous playback to be lower than expected. Additionally, they take 1.5 hours of charging, which is disappointing for such a short battery life. On the upside, the case acts as an 850mAh power bank which you can use to charge other devices too. Unfortunately, they do not have a companion app with customization options.

5.7 Battery
Battery Type
Battery Life
3.3 hrs
Charge Time
1.5 hrs
Power Saving Feature
Standby mode
Audio while charging
Passive Playback

These headphones offer just above 3 hours of continuous playback on one charge. This is disappointing when compared to the 5 hours that were advertised by xFyro, especially since they take an hour and a half to charge fully. However, the case acts as a power bank for the headphones, and you can also charge other devices with it. You can expect a total of 30 hours of battery life according to the specs sheet. They also have a quick charge feature that gives you 75% of battery life in only 30 minutes of charging, but we can’t measure this accurately with our current test bench. Also, they go in a standby mode after being idle for a few minutes and can last up to 300 hours according to xFyro.

0 App Support
App Name : N/A
iOS : N/A
Android : N/A
Mac OS : N/A
Windows : N/A
ANC control
Mic Control : N/A
Room effects
Playback control
Button Mapping : N/A
Surround Sound : N/A

These headphones do not have a companion app with customizable options.



These truly wireless Bluetooth headphones can be quite confusing to use at first, as you always need to power and pair the right earbud first. Then, you can connect the left one to the right one. Unfortunately, if you don’t do it in that order, audio channels are going to be switched around. They also have higher than average latency for Bluetooth headphones and won’t be suitable for videos and gaming. On the upside, they have amazing wireless range, and you shouldn’t have too many audio cuts.

6.0 Bluetooth
Bluetooth Version
Multi-Device Pairing
NFC Pairing

These headphones do not have multi-device pairing or NFC support. Their pairing procedure is also a bit complicated as you always need to power up the right earbud first, which connects to your device and then connect the left earbud to the right one. If you connect the left one first, channels will be inverted. However, you can connect each earbud to two different devices but can’t connect them as a pair to two devices.

0 Wired
OS Compatibility
Analog Audio
USB Audio
PS4 Compatible
Xbox One Compatible
PC Compatible

The xFyro xS2 are truly wireless headphones that do not have any wired connection.

2.1 Base/Dock
Charging Case
Optical Input
Line In
Line Out
USB Input
RCA Input
PS4 Compatible
Xbox One Compatible
PC Compatible
Power Supply
Dock Charging

They have a charging case that delivers up to 30 hours of extra battery life according to the specs sheet. However, it has no inputs.

9.5 Wireless Range
Obstructed Range
60 ft
Line of Sight Range
199 ft

These headphones have excellent wireless range. With 60ft of obstructed range, you’ll be able to walk around a small apartment or office without gearing too many audio cuts. You shouldn’t have any problem especially if you keep your audio source on you.

0 Latency
Default Latency
326 ms
aptX Latency
aptX(LL) Latency

Like most Bluetooth headphones without any lower latency codec, these headphones have too much latency to be used for watching video content or gaming. Also, they even have higher-than-average latency and what you will hear won’t match what you see on your screen.

In the box

  • xFyro xS2 headphones
  • Charging case
  • 3x tip options
  • Micro-USB charging cable
  • Manuals

Compared to other Headphones

The xFyro xS2 are decent mixed usage closed-back in-ears with a few flaws. While they are decently comfortable for in-ears and look good, these headphones are quite disappointing when compared to other headphones in a similar price range. Their sound quality is mediocre, and their battery life is short. On the upside, they have good isolation performance and amazing wireless range. See our recommendations for the best earbuds, the best earbuds with a mic, and the best wireless earbuds.

Jabra Elite 65t Truly Wireless

The Jabra Elite 65t are better headphones than the XFYRO xS2. They are better-built and also have better audio reproduction, longer battery life, and also have a companion app with customization options. They also have a better control scheme and can connect to two devices simultaneously. On the other hand, the XFYRO xS2 have amazing wireless range and their case acts as a powerbank for other devices as well. They are also slightly more comfortable.

Apple AirPods 1 Truly Wireless 2017

The XFYRO xS2 are more versatile headphones than the Apple AirPods. They have better isolation due to their closed-back design, which makes them a better choice for commuting and to use at the office. They also barely leak, have great wireless range, and aren’t exclusive to Apple products. On the other hand, the AirPods have significantly better build quality and have one of the best cases we’ve tested so far. They also have better battery life, but they lack a lot of bass.

JBL Free Truly Wireless

The JBL Free are better headphones than the XFYRO xS2. They outperform the XFYRO in pretty much every category. They are more comfortable, are better built, and they have great audio reproduction. Both headphones have short battery life, but the XFYRO have better wireless range and you can also use their case to charge up other devices, which can be useful.

Jaybird Run Truly Wireless

The Jaybird Run are better headphones than the XFYRO xS2. They have a more comfortable and better-built design. They also have a sound profile that follows our neutral target curve better and they also have a companion app that lets you EQ them to your preference. Their stability fins are also very useful for more intense sports and the headphones won’t come out of your ears. However, the XFYRO have better wireless range and better isolation performance, which make them a decent option for commuting.

Altec Lansing True Evo Truly Wireless

The XFYRO xS2 are better truly wireless headphones than the Altec Lansing True Evo. They are a bit more versatile thanks to their better isolation performance, which can be useful while commuting and at the office. They also have better wireless range and take less time to charge, for about the same battery life. On the other hand, the True Evo feel better-built, and some may prefer a design with stability fins for sports.

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6.7 Mixed Usage

Decent mixed usage headphones. They won’t have a great audio reproduction necessary for critical listening, but their portable design and good isolation performance make them an above-average choice for commuting and to use at the office. They are also stable enough for light sports activities, and their in-ear design won’t trap heat. However, they have higher-than-average Bluetooth latency and will not be suitable for gaming and watching TV.

6.5 Critical Listening

Average for critical listening. These headphones have a mediocre sound quality with a lack of low bass and overemphasized high-bass and low-mid. Resulting in a boomy and cluttered mix, especially on vocals and lead instruments. Their treble range is also uneven, and some leads lack detail while some sibilances are overemphasized. Our unit also had a frequency response mismatch between the two drivers.

7.3 Commute/Travel

Above-average for commuting and traveling. They have good isolation performance, and they practically don’t leak so you’ll be able to raise your listening volume at high levels without bothering people surrounding you. They might be comfortable enough for short bus trips, but the in-ear fit might not be ideal for long flights.

7.8 Sports/Fitness

Good for sports. Their small and portable design makes them suitable for this use case. They are also truly wireless which gets rid of the risk to have a cable in your way or getting stuck on something. Like most in-ears, they are breathable and are stable enough for light physical activity. Those training in crowded gyms will appreciate their decent seal and isolation performance.

7.1 Office

Decent for the office. They isolate a good amount of noise and block ambient chatter well. They also barely leak so you’ll be able to enjoy your music at high volumes without disturbing surrounding colleagues. On the downside, the in-ear fit might not comfortable enough for a full work day and their short battery life will require you to charge them during the day.

5.4 TV

Poor for TV. These headphones have mediocre sound, and their latency is too high to be suitable for watching TV as what you hear will not be in sync with what you see.

4.4 Gaming

Bad for gaming. The xFyro xS2 have mediocre sound quality and have a sub-par microphone for online gaming. Also, their latency is too high to be suitable for gaming. They are also not compatible with consoles, and their battery life will be to short for long gaming sessions.

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