Sennheiser, as a brand, doesn’t need our presentation. It is among the largest and oldest manufacturers of personal and professional audio products, located in Germany and existing for more than 75 years. No doubt that their professionalism allows to create the most polished used experience mixed with the highest functionality at the forefront of the progress. A bit of conservatism that stops them from releasing raw products just to overtake the competition only show brand strength and differs it from smaller, less patient and picky ones. As the result, the end customer might play with the latest technology from the smaller brands, but the will to try similar products from the industry leaders still remains.

Couple of more words about the vendor which plays and important role in this review: we are rarely dealing with the largest and the most famous audio brands due to a simple reason – its price. Most of the hundreds of IEMs and other products that has been reviewed on our website are less expensive rivals which we can or cannot recommend to others according to our expertise. There are a lot of products which became a real bargain even in comparison to matured brands. Whereas some are just a shade of what it is meant to be… For brands of the first echelon like Sennheiser, Audio-Technica, Yamaha, Beyerdynamic, JBL, etc, 99% of their products is the win, with almost no mishaps. But the price bar is much higher, in similar 99% of the cases. The only option to have a bargain here is to find the best price from trusted vendor. In case of Sennheiser and Audio-Technica (more brands would show up there soon) there is Voonaudio store that lists 100% authentical products with the best price compared to other online stores (excluding when brands provide the additional seasonal super sales/deals on Amazon or other official online shops). This finally makes us possible to test some famous products that were quite pricy before (product price + logistics). Momentum TW 3 set was provided for the review for free but considering the offer, we can finally plan some spendings on less common items like turntables, for instance.

Back to Sennheiser Momentum True Wireless 3:

Technical specs:

Most interesting features to outline in this product:

• Supports aptX and aptX Adaptive (24bit/96kHz, up to 620Kbps) Bluetooth codecs
• Active Adaptive Noise Cancelling technology with Transparency mode
• 3 mics / channel
• Smart control application for iOS and Android
• Wireless and wired charging
• IPX4 waterproof
• Multipoint support (2 devices at once)
• Great fit by exchangeable ear tips and fins

Device packaging and bundle:

Momentum arrived bit later than expected due to reasonable problems in the logistics between China and Ukraine. We were still surprised that it took only 16 days by a regular air parcel method to arrive. European hub reported that it arrived from China in 8 days, the rest was truck transportation from Germany to local hub and to its final destination afterwards.

The appearance of the product was definitely created with the intention to greet the customer with Christmas and New Year celebrations. Creativity and care stands behind the additional outer wrappage which also contains Voonaudio CEO (Samantha Lind) signature.

Thanks guys, happy New Year too!

Here is the standard Momentum True Wireless 3 box without the additional cover:

Box contains large amount of product and company information but the most important is the availability of counterfeit protection sticker that shows that it is 100% original Sennheiser TWS.

The insides are split in two vertical compartments, one holds IEMs with charging case and another stores all provided accessories.

Apart from TWS and its case, the bundle consists of:

• 4 pairs of silicone ear tips (XS, S, M, L)
• 3 pairs of fins (with slightly different shape)
• type-C to USB A charging cable
• user manual, warranty card and couple of leaflets

Can’t tell that this is the best bundle we’ve seen among all TWS that we’ve tested, but the availability of different sizes of fins and tips builds the confidence that the fit should be great.

Design, feel and fit:

As the representative of TWS IEMs, Sennheiser Momentum True Wireless 3 consists of left and right channels and charging case that plays a role of a power bank. Case is made of plastic, fully wrapped with cotton material. Sennheiser logo at the top, type-C charging port with LED indicator at front.

Top case cover holds quite tight by the large integrated magnet. No way it would open by itself. Inner IEM contacts also hold each channel in the compartment with relatively strong magnetic force that would secure it from falling out if turned up side down. Case build quality is excellent, everything is perfectly aligned and crafted.

IEMs have similarly perfect finish and crafting – made of plastic but feels rigid. Perfectly aligned parts, clear openings and neat look. Top covers consist of brand logo, couple of mics and touch sensitive panels:

4 contacts, additional mic, proximity sensor and LED indicators on the bottom.

Sound channels are covered with nylon mesh for dust protection purpose. Additionally, each ear tip has its own dust protection in a form of foamy insert. Glad to have that since the most of the problems with IEMs happen due to dust and dirt getting inside the shells.

At first we were not confident about the fit – IEMs look pretty large and feels heavy. Although, its shape together with different fins and ear tips allowed to find the most comfortable and tight sitting option that even allows to use Momentum True Wireless 3 during active workouts. Weight is not causing any inconvenience either. When fit is great you just forget about IEMs in your ears. Of course, it would not win over any custom-shaped wired IEMs, but surprisingly good and gives the additional freedom due to being wireless.

One of the most important questions – how good is the fit comparing to other types of TWS, like earbuds (certain Apple products) or IEMs with long leg (like Huawei FreeBuds 4i), for instance…. Unfortunately, it is still a question of compromise:

• Earbuds are the most comfortable for long and calm use but least secure for fitness and worst in sound quality due to lack of passive noise isolation
• IEMs like Huawei FreeBuds 4i are less secure than Momentum TW 3 during active movements and have worse sound due to lack of room inside the case but should have better voice pick up due to lower position of microphones.
• Momentum feels much more secure but heavier. It might not be as comfortable than other two through the whole day.
• As to such types of TWS as ear hooks with IEMs (FiiO UTWS 3) – best sound quality due to optional preferred IEMs but the worst fit – feels bulky and not too natural.

Apart from physical comfort and fit, there is also such very important aspect of TWS IEMs as its acoustic feel. Some people might have bad experience with wearing in-ear monitors for a long time. It really might cause a lot of discomfort, physically as well as psychologically. Constant pressure against tympanic membrane may cause dizziness, headache, nausea, etc. But we can assure you that it is not about the Sennheiser Momentum 3 – it has the necessary transparency modes among all of its features to completely remove any negative effect during the long-time wearing session.

Functions and user experience:

Momentum True Wireless 3 is quite sophisticated products that features all expected functions that should exist in modern TWS. Besides, all declared functions tailored well in its logics, which is one of the main advantages of having more expensive product from the leading brand. We would like to go over main functions to describe the implementation quality and our feedback about each one:

• Active Adaptive Noise Cancellation: can be activated in two modes (only wind noise reduction or full noise cut off), controlled with the touch on sensor panel (types of tap and channel side can be set in the app). Does really impressive job in full noise reduction mode. No audible change in sound quality but leaves most of the distracting external noises out. Active noise reduction in Huawei, Xiaomi, Apple TWS is definitely less capable (never tried Sony though, people say that it is pretty darn good as well). Of course, if using Momentum 3 only to isolate from the surroundings, without listening to anything, the effect of extra pressure would be apparent. Switching to wind noise reduction only or to transparency mode totally removes possible negative feel. In real usage scenarios, when listening to audio or speaking over the phone with ANC activated to its full potential – you would barely notice any external noises and can totally focus on the sound coming to your ears from IEMs. One note about ANC control: touch sensors on IEM housings allow only to switch between OFF and one of ANC modes (wind reduction, full), whereas the app allows to select any ANC mode in real time and to set which one would be activated with the touch.
• Transparency mode: can be activated in 2 modes (along with audio and activating pause when enabled), controlled with sensor touch (types of tap and channel side can be set in the app) or by the app. Again, app allows to select either of 3 modes (OFF, along with audio, pause the audio) and sets which of the modes would be selected apart from OFF. Similarly to ANC, does a very good job on amplifying surroundings right to your ears. Releases any type of pressure that might annoy during long wearing sessions. Of course, the best effect is when the audio is set on pause, but the incoming voices are quite audible even when the music plays (if it is not very loud). Most of the amplification applied to upper mids rather than treble or lows.
• Multipoint connection: when updated to the latest FW, Momentum 3 can be connected to 2 devices simultaneously. It would allow audio and phone calls from either device, whichever initiates it first. At the same time, we can connect to other devices and store it in TWS memory but only two of those would be active at a time. The rest would be inactive until one or both of the active two would get disconnected. New device pairing process can be initiated by tapping and holding both channels for 3 seconds. Channel LEDs flash red/blue when pairing takes place. The entire list of all stored and currently active devices is shown in the app.
• aptX and aptX Adaptive BT audio codecs: first of all, base or enhanced codec that would be used to play audio with Momentum 3 is defined by the smartphone. If it is relatively modern and supports aptX / aptX Adaptive – aptX would be selected by default with the ability to switch to aptX Adaptive from the app. The difference is mostly vital for lossless audio tracks and respective music player apps that can handle it. aptX is commonly known as 16bit/44.1KHz while aptX Adaptive is substituting more recent aptX HD and bringing 24bit/96KHz, 620Kbps stream with lower latency. Therefore, being almost similar to LDAC and UAT, aptX Adaptive the the best codec currently available for Bluetooth audio – the closest match to the full-frequency quality over the wires. Currently used codec is displayed upon connection in the app itself and under BT connection settings of a smartphone. If aptX is not available, regular codecs like SBC would be used instead.
• Separate use of channels: either left or right channel can be used independently for audio and phone calls. It takes only about a second to activate and synchronize when the second channel is taken out of the charging cradle. The difference between left and right would maintain in types of controls programmed for each one. If some side functions are programmed for the left – the right one would not activate it if you pick it instead. And vise versa. But main functions would remain the same for either one. Another way to control missing functions when using single channel – is to use the app. Both channels equipped with the proximity sensor which means that audio would be stopped or initiated when wearing it. Transparency mode would work and can be manually activated even with a single channel.

It seems that Sennheiser did a great job on developing the application for its TWS products. It is the first time in our practice when the app really helps to see what’s going on and allows to use various additional functions. Therefore, we would like to describe what it is capable of:

The initial screen allows to connect new and see the list of all Sennheiser products that has been located on this device:

First app screen shows the main functions:

• Shows cradle and active channel battery level
• Shows current connection status
• Allows to see the list of connected/paired devices
• Allows to tune and set EQ (it is possible to create own 3-way EQ profile or select one of the presets)
• Allows to run sound check and tune the sound (means running any audio and selecting different presets in special wizard which finally creates your own preferred sound profile)
• Allows to select Transparency mode and to set which one would be activated with the touch
• Allows to select ANC mode and to set which one would be activated with the touch
• Allows to create sound zones based on the location (activating functions in different GPS locations)
• Allows to set touch controls for each channel

Discover tab is for the product and interest related news feed

Settings tab:

• Allows to see and update FW version: updates take about 12-15 minutes, no matter whether earbuds are placed in or outside the case. LEDs would flash green/purple during the process until finished. Smartphone should stay in the area of BT coverage.
• High res audio mode: allows to force aptX Adaptive codec if supported by a smartphone
• Smart pause: allows to set music on pause when either one of the channels is removed
• Allows to automatically accept calls: picks up the phone if any channel is removed from the cradle
• Sets auto-power off interval when removed from ears but not placed in cradle
• Activates and deactivates tone & voice prompts
• Shows currently used BT audio codec
• Displays model name
• Allows to select app language
• Allows to select tiles (functions) that would appear on the main app screen
• Allows to perform factory reset
• Allows to send user feedback
• Lists FAQs and short help on different functions

Pretty powerful and informative application in comparison to most of the app from other vendors which are used once per quarter to check if there is an update. You would definitely use it for ANC, Transparency mode activation, EQ tuning along with FW updates or new device connections. For example, Huawei TWS app feels too heavy and slow with its smart hub and plugins. Moreover, it is not that informative. You visit it once to learn how to control TWS and never go back. Better to skip Huawei updates as well – the last one made ANC almost unusable (non-existent). We’ve already had one FW update for Momentum True Wireless 3 – its changelog was clear and promising as well as the final TWS performance became even more comfortable. We think that such consistency and wise approach from Sennheiser would remain and this is another valuable side of purchasing products from a leading brand.

Momentum True Wireless 3 audio/voice quality:

We’ve tried Momentum 3 with Xiaomi Redmi Note 8 PRO, Windows 11 E14 ThinkPad Notebook, Hidizs AP80 Pro DAP and Xiaomi Qin F2Pro. There were no problems with connecting to either one of these devices; discovery process and connection went fast. Connection keeps stable within one room and shows rare frame drops behind 1 concrete wall. For example, Huawei TWS start to loose the connection when smartphone is placed in back pocket. Nothing like this with Momentum 3 IEMs.

Voice pick up quality is great, responders say that my voice sounds naturally, clear and close to the mic. There were no problems with environmental noise during calls either. Wind noise / evenly spread noise is reduced to the point when the responder doesn’t notice it at all, only some sudden and sharp sounds might break in. Considering all that said, our worst expectation about possible bad quality of voice pick up due to physical shape of IEMs faded away.

Now, about the music: years and hundreds of tests of wired IEMs made us very sensitive and demanding in this respect. Earbuds (apart from some very rare ones like certain Smabat or Ourart models) don’t work at all even when connected with wires. Therefore, similar types of TWS definitely fall short of sound quality expectations adding BT codec problems over its physical fit problems. As to IEM-type TWS, we’ve found the direct relation between the size and shape of channel shell and its resulting sound quality. TWS IEMs with long-protruding leg (battery and mics inside this leg) and small-sized shell sound pretty similar to each other: mostly focused on middle part of the spectrum (which is logical for better voice pickup), with limited abilities on both ends. Tight speaker chamber and insecure fit cut the lows, while BT codecs (especially regular ones like SBC or AAC) severely affect treble. Momentum 3 is addressing both issues with large speaker chambers and the most enhanced BT codec so far. At the same time, more secure fit and much better passive noise isolation creates more linear AFR feel, with even spread across the entire range. Bass is present, pleasantly wide and deep, feels much closer to some regular, wired high-quality dynamic IEMs. Middle section and mid bass sounds dynamic and rich, although a little bit shallow to our liking. Better for linearity but leads to kind of congested stage. Treble is pretending to be extended and bright but still not this airy, sparkling and natural as we got used to with wires. Instrument separation is moderate, stage is pretty small. Resolution is surprisingly good for bluetooth IEMs throughout the entire range. In fact, the good thing is that in overall Momentum True Wireless 3 sound quite balanced, pretty warm and accurate. No will to take if off and switch back to wires. Which is the most important for us.

Comparing with Huawei FreeBuds 4i:

Different shape result in different sound. Huawei is not doing that good in any respect. Fit, passive noise isolation are much worse. ANC performance is not good at all with the latest FW update. Sound is focused mostly on mids.

Comparing with Xiaomi Buds 3T Pro:

Slightly better than Huawei but similar problems with ANC. Moreover, the app is not that useful – feels less consistent. Sound is close in its nature but lacks the extension at both ends as well as the balanced feel of Momentum 3.

Comparing with Divinus Ostia:

Ostia are great TWS IEMs for music. Apart that it neither features ANC, nor the transparency functions. Much less functional but pretty good for audio purpose. Sound is very close and we would say that even more accurate on treble, although not that extended on lows.

Comparing with FiiO UTWS2 + HiRes IEMs:

If to compare like this, you should understand that BT ear hooks would never be as comfortable and cannot stay for long time with you as a result. One hour is ok, but not for the whole day. At the same time, it is the best sound quality what we can get in comparison to wires. With UTWS3 we can use any of our preferred IEMs while BT hooks would work with the latest BT codecs like LDAC. What really suffers in such pair is the quality of phone calls (mics are less sensitive, ANC is not present). Moreover, we had some slight problems in synchronization between 2 channels after short periods of using single one for calls.

Conclusion:

Despite that we are still not convinced that Sennheiser Momentum True Wireless 3 IEMs can totally satisfy audiophiles, this is definitely one of the best TWS on the market. All of the declared features and functions work perfectly, assisting app is great, ANC and transparency modes are very effective, sound is linear and balanced, voice calls sound natural, fit is secure… Even touch controls and proximity sensors behave precisely. All chances that Momentum 3 would become everyday companion no matter the surroundings – loud, extreme or calm. One of our main conclusions is that the overall Momentum 3 performance clearly defines its price and demonstrates the might of Sennheiser brand. So many details are polished and so satisfying is our user experience. Great modern product.

Sennheiser Momentum True Wireless 3 was provided for the review by Voonaudio: link to the official store. Check out their prices and than try to find a better offer…

Short description about Voonaudio from their official website:

1. Voonaudio is a fully authorized and differentiated brand store to provide branded high-quality audio devices. We, as experts, promise 100% authenticity and value for everything we sell backed by our passion to share the love for music.
2. Our Vision
   · Say goodbye to tedious price comparison
   · Say goodbye to time-consuming pre-purchase research
   · Say goodbye to scams and knock-off audio gear
3. WE PROMISE
   100% Authenticity Guaranteed
   Most Competitive Price Guaranteed
   30 Days No Reason Return
   1-Year Warranty Offer
   Fast Global Shipping
   We Cover around 20% VAT for Europe Countries. You just pay a few %

As TWS victorious march on mass market continues, even highest audio quality focused individuals (as us) are sometimes turning their heads to see whether wireless technologies are getting closer, or to find the most convenient compromise for a regular use. Large amount of TWS options that are currently available for purchase are always divided in three segments (at least in our heads): utilitarian TWS, musical TWS and wireless buds that would never serve a purpose for an audiophile (like Apple EarPods) due to its shortcomings in physical design and lack of latest high-grade codecs. The rest of the two can draw our attention but with lots of “if”.

Currently, we have came up with the following conditions for each of two types:

Utilitarian TWS: best to be high-quality earbuds with detachable cables (Ourart ACG, etc) accompanied by high-quality Bluetooth modules (like FiiO UTWS3, etc). In this case we are getting the most of audio quality with the latest BT audio codecs, ability to detach and change earbuds, good quality of phone calls, and the last and most important – buds are not creating vacuum and don’t make you feel uncomfortable throughout the day.

Musical TWS: it should be high-quality IEMs with latest BT audio codecs, with excellent fit and ergonomics.

Now, when we have defined TWS types, we can introduce our new review topic and try to define which type it belongs to…

DIVINUS OSTIA (DVT-100) – TWS IEMs from quite new brand that has some essential peculiarities: first, it is from South Korea (R&D and QC are domestic), second – it is based on in-house DD driver and third – it is music-oriented TWS. Here is the link to official product page: LINK and here is the page to read about DIVINUS brand: LINK

OSTIA tech specs:

• IPX7 (perfectly finished housing protects product from water)
• Light weight, compact size, total weight 39.1g including charging case
• Custom designed DV1 driver (6mm DD Driver)
• Bluetooth 5.0 connection with TWS
• C-type charging port
• Wireless charging
• 20 hours of total usage time, 5 hours playtime per charging
• Voice assistant
• Touch control
• AAC/SBC codec supported
• In-ear type earphone

Official AFR:

The most interesting parts in OSTIA specs is that it has IPX7 protection and wireless charging built in to its charging cradle. Although, no charging base is included. Furthermore, the absence of HD audio codecs makes us doubt its audio performance which we would describe in the sound quality section.

DIVINUS OSTIA available for purchase here: LINK

Packaging and design:

OSTIA comes in pretty small box that contains product graphics and information. Inner part of the box is split into two parts: one holds the cradle with IEMs inside and the other contains two boxes with the accessories. The full box package consists of the following:

• OSTIA cradle
• OSTIA IEMs
• 3 pairs of silicone ear tips
• USB type C charging cable

Along with this set, we have received a set of memory foam ear tips and a set of sound filters. As we’ve understood, those two are the options and can be purchased separately. We would say that sound filters should actually be a part of the product bundle since those act as a dust protection and significantly normalize sound performance on treble… Absolutely a must for OSTIA TWS.

Both OSTIA cradle and IEMs are very compact in size and lightweight. Perhaps, the smallest cradle so far among all we’ve seen. Everything here is made of plastic with the main design element in a form of polished plate with shiny silver DIVINUS brand logo at the top/facing side. Cradle exterior is equipped with 4-segment LED charging indication, type C charging port and integrated carrying lace. Inner compartment has separate L/R IEM beds with magnetic charging pins.

Magnetic force is enough to keep IEMs at place when cradle is opened and held up side down. Despite its low weight, cradle battery capacity is enough to charge a pair of IEMs 4 times. Considering that IEMs can last for 5 hours per charge, it gives around 20 hours of playtime in total.

OSTIA IEMs shell is made of two perfectly aligned parts. Each channel is equipped with a mic under aluminum grill, channel indication, multi-color status LED, compensational opening, charging contacts and sound output nozzles. As mentioned before, nozzle opening are not protected by any means out of the box and require optional sound filters to be fitted. Shape of the nozzles is regular which makes it possible to use any common after market tips. Facing sides of each channel represent touch control sensors. All commands are listed in English user manual. Here we should state that most of the expected controls are embedded (start/stop, back/forward, pick up/hang up), except the volume. It adds some inconvenience since the volume can only be controlled from a source.

Fit:

OSTIA IEMs have good ergonomics and excellent universal fit. Nozzles are long enough, tips provided in 3 sizes and the weight is very small. No problems with the fit even during active movements. Moreover, considering that it has IPX7 protection – no worries about sweat or rainy conditions.

In use:

OSTIA cradle and IEMs takes the charge from empty to full for about 2 hours. Can be charged simultaneously. Pairing is initialized when IEMs are taken out from the cradle and there is no known source is available to connect to. Switch off happens when IEMs are placed back to its place. Each channel can be used separately or in pair. This logics works seamlessly, no problems met with Xiaomi smartphones as a source. Although, there is no multipoint connection function which means that IEMs would produce sound from only one source at a time. On the other hand, it would store multiple device in pairing memory for lighting-fast connection to any previous one.

Touch controls and voice assistance work as expected, quite smooth and reactive. The only inconvenience with that might appear when removing and fitting IEMs from you ear – accidental single touch of facing plate might occur which would result in music start/stop or call pick up/hang up.

Mics are doing a good job in phone calls. No bad response from other party during calls in office or home environment and some light noise interruptions outside.

In overall, we like how OSTIA TWS are made, feel and perform in everyday usage scenarios. FW and logics made good, no errors or flaws in the performance, fast and stable connection and seamless IEM swaps.

Sound quality in comparison…:

Due to the brand background and declared product qualities, we were expecting OSTIA to be musical enough to keep on par with IEMs with Bluetooth hooks combination or with musical TWS like TFZ X1, at least. And it appears to be somewhere in between. Bluetooth hooks like FiiO UTWS3 that support AptX codec, have dedicated amp and based on more advanced elements are several steps ahead of OSTIA in terms of sound quality, especially in retrieving textures /depth on lows and clarity / extension on treble. FiiO modules also bring more details and overall resolution over entire range and better dynamics / articulation in mid bass region. OSTIA feels more tending to show it V-shaped nature with excessive accent on treble and bass areas, lacking maturity and naturality on mids. But mind that FiiO UTWS3 were paired with such great examples of DD IEMs as Hidizs MS2, for instance. Such bundle has much higher price and much less convenient in everyday use.

If to compare to TFZ X1 – another musical TWS with very similar specs – OSTIA keeps up very good and has some significant advantages in sound and overall performance. Sound wise, OSTIA is doing a better job on lows – extension is better, bass sounds deeper and more pronounced in overall. Treble is much closer in its performance, but slightly more delicate and less abrupt and straight-forward. Mids are quite similar, shifted back in both cases and emotional due to tendency towards upper mids area.

In overall, our conclusion that the sound quality of OSTIA is quite far from the best wired DD IEMs which we’ve got used to but its performance as TWS for everyday is very good. Sound quality in such scenarios is totally enough and what is the most important – user experience is close to perfect.

One more word about optional sound filters – it is a must for OSTIA IEMs. Treble section gets quite lisping with no filters attached.

Conclusion:

The main conclusion for us is the proof that Bluetooth TWS are still a good option for general usage, but yet too young to play on wired audio IEM ground. On the other hand, OSTIA definitely belongs to TWS vanguard with the best user experience due to its stellar functional performance, excellent fit, convenient operations and good sound quality. It has the advantages in sound and logics over some more popular brands even despite being quite new to the market. Almost flawless first attempt, worth of attention for general use even on highly saturated mass-market. Audiophiles pass by, but less sophisticated listener should appreciate.

DIVINUS OSTIA available for purchase here: LINK

Another look at Bluetooth wireless receiver from a different perspective (means another formfactor). This market is trending and so many options are available that it is hard to make the right choice from the very first try. We’ve already been playing with TWS IEMs, Bluetooth neckband wires and standalone devices but not the “ear hook” type DAC/amps. Seen those couple of times before on sales but not from a trusted brand or a supplier. Although, such formfactor always looked promising and intrigued with the possible comfortable fit, battery capacity and max. power potential due to a larger compartments and its universality for different types of IEMs. To be honest, looking at the picture of such type of product, we are not making another idol: yes, it should be better than any other all-in-one TWS or Bluetooth receiver in certain aspects, its universality would stay limited to several IEM shapes or connection types and the product would be worthy to try only after it has passed several iterations and came to a stage of maturity…

With all that in mind, FiiO UTWS3 was kind of a surprise – coming from a well-known portable audio brand, full of features and impressive specs. For us, the most important is that this product represents the next iteration with heavy upgrades to its predecessor – original FiiO UTWS (UTWS1). At least, it means heavy usage, collecting feedback, thinking over, bug fixing, improving and upgrading various aspects, both software and hardware which eventually leads to a better product with polished user experience. Whether it is that mature already? – we would tell in the conclusion. Meanwhile, here is some infromation about the company, a small flashback to FiiO UTWS history and the idea behind its new version:

First of all, about FiiO brand in short:

Guangzhou FiiO Electronics Technology Co., Ltd. was established in 2007 by several former senior staff and tech experts of OPPO, which is a high-tech enterprise focusing on researching and developing portable music products, with current main products being Hi-Res music players, headphone amplifiers&DAC, and headphones/earphones.

There are over 300 employees in total, including a core team with nearly 30 years of R&D experience in audio products, an R&D engineer crew dedicated to software, hardware, industrial design, structure and electroacoustics. The production factory covers an area of 3500 square meters, including an all-new updated dust-free workshop and 4 two-way assembling production lines, with an annual production of up to 1 million pcs.

FiiO specializes in self-research and development, and sells FiiO-branded products through sales agents worldwide which cover 5 continents spanning 65 countries and regions. Since its establishment, FiiO has built a good brand reputation in the industry. In Nov. 2017, the Headphone Branch of China Audio Industry Association was found, while FiiO was honored to join and elected to be the vice-chairman; 3 years in a row from 2017 to 2019, FiiO has been on the Top 10 HIFI Headphone and Digital Audio Brand list, as well as Chinese Top 20 Cutting-Edge IP Enterprise and Guangzhou Little Giant Enterprise of Science and Innovation; By virtue of outstanding product designs, FiiO has received 47 valid patents, including 2 invention categories, and countless well-known awards, including iF Design Award, Reddot Award, EISA Award, VGP Award, and Spring/Autumn Headphone Festival Award.

FiiO has been continuously carrying on the music proposition of “Born for Music”, placing great importance on user needs and ceaselessly pursuing perfection in product design and manufacturing, to supply users with the best audio products at the best prices.

FiiO has already been long involved into Bluetooth audio devices and released full bunch of products with different usage scenarios in mind:

• BTR series Bluetooth AMPs (for use with a smartphone, PCs, etc with the regular IEMs or headphones)
• FB1 IEMs with integrated neckband Bluetooth cable
• EH3NC Bluetooth overheads with noise cancelling feature
• TWS IEMs (popular model of the trending market)
• UTWS1 – Bluetooth ear hooks to use with any IEMs

Considering the popularity of UTWS1 (and its shortcomings on the other hand after some heavy usage) – FiiO has decided to give it a new birth when the product would be free of any previous bugs and inconvenience. Initially, UTWS1 were based on the third-party product that already had some hardware limitations in its core. Therefore, the new generation was decided to be given in-house design, research, development and production processes. The main points of concern (i.e. upgrades) during UTWS3 development were the introduction of independent amplifier, significant increase of the output power and decrease in noise floor, more convenient charging scheme and longer battery life, better noise cancelling ability, IPX4 protection, new volume and power cycle logics and dedicated control application. All of that eventually leads to much better ergonomics and user experience. As far as we are concerned, all of the known and reported issues and inconvenience of the first generation UTWS1 were addressed and claimed to be resolved.

To finalize about the difference to its predecessor, here is the full list of upgrades in UTWS3:

• Now uses independent TPA6140A2 AMP
• Power output increase from 5mW to 25mW at 32Ohms
• Noise floor decrease from 25uV+ to <8uV
• No need to charge each channel with a cable, both take charge from a cradle now and charge faster
• 2nd microphone added for better noise cancelling ability
• Added IPX4 environmental protection
• Volume controls better now (26 levels, better physical buttons)
• Power ON|OFF is now controlled with cradle top cover
• Uses FiiO Control app for settings, upgrades and tuning EQ

Done with the history… Let’s get back to FiiO UTWS3. The specs are as following:

• Chip: Qualcomm QCC3020, Bluetooth 5.0
  • TWS+ Low Latency (2 channels connected at once)
  • 2 independent amps
• Bluetooth codecs: SBC, AAC, aptX
• Output Power:
  • 38mW（16Ωload）
  • 25mW（32Ωload）
• Noise: ＜8μV
• Driving ability: 16~100Ω
• THD+N: ＜0.06%
• SNR: 100dB r”A“
• Output Impedance: ~0.7Ω
• Crosstalk: 94dB
• Balance: ≤0.5dB
• Working Time:
  • TWS+: 7hs of use/charge
  • TWS: 5.5hs of use/charge
  • Overall battery life 30h (800mAh) (4-5 recharges from the case)
• Mics: 2 mics/channel with noise cancelling feature
• Device control over: FiiO Control APP
• Physical controls: multifunctional button (per each channel, on cradle)
• Indicators: multicolor LED (each channel and cradle)
• Wires: silver plated copper integrated wires
• Environmental protection: IPX4
• Connections: MMCX or 2-pin, 0.78mm
• Dimension: 93.5×71.1×34.6
• Weight: 125.5g

FiiO UTWS3 official page: LINK

FiiO UTWS3 purchase link on Amazon: LINK

FiiO UTWS3 purchase link on AliExpress: LINK

Packaging and design:

FiiO UTWS3 comes in relatively small and visually attractive box consisting of outer cover with product graphics and company information and the inner more sturdy black cardboard insert that holds the product itself. FiiO has added a special sticker on the back side of the outer cover as a solution to counterfeit item protection.

Inner box compartment has a special soft insert that holds UTWS3 cradle at place while the cable, user manual and warranty card are stored in the separate envelope underneath. Not much of the accessories, though. Only ear hooks with the cradle and charging USB type-C -> USB B cable. Wonder why FiiO has not included any carrying pouch for the sake of the product long-lasting protection.

Ear hooks are stored inside the cradle and have special stickers pre-applied to charging pins in order to avoid charging during the delivery. Good way to prevent early battery deterioration before it gets to the end user. Just don’t forget to peel it off before use. Cradle, itself, makes a good impression and feel – little bit rough surface, accurate and even strict design. Someone might say that it is boring due to lack of design elements but we’d rather call it – functional. Lightweight, though, We expected its weight to be much more than it really is. There are 3 LED indicators at the facing side of the cradle and USB type-C charging port at the back. Nothing more.

Top cradle cover opens with little effort, totally enough to keep it at place under any circumstances when the external force is not applied. Can’t tell for sure whether it is retained with a magnet but there should be some kind of element like this that enables power off|on logics for the ear hooks. Anyway, folding mechanism looks to be quite durable and feels natural.

The insides of the cradle look more appealing than the externals – neat ear hook profile cutouts at the top cover and base aided by the combination of grey (scratch protection soft material adhesives) and black colors, deep lodgments designed to store third-party IEMs or earphones of virtually any size and shape. Plus the additional button at the most convenient place that does some vital tricks. Don’t worry, it won’t be used too often, only for some initial procedures.

Apart of the cradle, FiiO UTWS3 ear hooks are much more sophisticated devices that contain all the magic. In terms of a design, they consist of the plastic base and flexible ear guides (perhaps, made of a silicone with inner channel for 20 strands of monocrystalline silver plated copper wire). Both channels have FiiO logos on the facing part along with large, easy to reach multifunctional button.

Furthermore, both channels feature 2 microphones protected by aluminum grills, white LED indicators (same opening with the backside mic), magnetic charging pins, aluminum rings acting as channel indicators (left – blue, right – red) and MMCX or 2-pin, 0.78mm connectors (both versions are available for a purchase). And the weight/channel is only 6.5g (without IEMs). Additionally, since UTWS3 features IPX4 protection, both units have special dust/moisture gaskets protecting button and mic openings.

In overall, the design of the whole set is varying from strict and functional (cradle) to clean and practical (ear hooks) with only few eye-catching elements. But what is unquestionable is the precise manufacturing, perfect alignment of all elements and decent build quality.

Fit:

The main point about the fit concerns the type of IEM connector selected during the purchase. MMCX type seems to be the most universal option since the connector allows IEMs to rotate over Y-axis. It gives certain freedom of adjusting the angle at which any MMCX IEMs would go into ear channel. With 2-pin option, it seems that some IEM shapes might struggle to fit into the ears correctly, especially if the output nozzles are given some irregular angle (that deviates much from 90-degrees). It is only our thought that might not be the truth. But we would really appreciate if FiiO would consider redesigning the connectors. The best option would be to have MMCX ear hooks only + the additional MMCX->2-pin, 0,78mm adapter in a bundle. Such approach would solve 2 issues: it would make UTWS3 even more universal out of the box (no need to choose and stick to connector type) and it would also allow 2-pin adapter to rotate on MMCX connection base.

As to our version – MMCX – we have tried it with different types of IEM shapes (custom, bullet, droplet, round) – all seem to fit nicely. The least comfortable for a long ride were bullet-like shaped IEMs since the physical pressure to ear channel increases when UTWS3 ear guides flex more. This happens when IEM body is quite long, which is kind of rare. Short bullet-like IEMs as HiBy Beans, for instance, do not produce any discomfort.

One more aspect to mention in this section is the type of end gear to use in overall. FiiO UTWS3 is designed to be used on a constant basis, for music or videos, during workouts or simply to talk over the phone. The possibility to use each channel independently also makes UTWS3 a great substitute for a handsfree device. In either scenario that involves long sessions (except music or videos), full immersion with total real world isolation is not necessary and even dangerous. Outer noises should be coming in to save yourself from a possible incident, especially outside. Ok, you can use only 1 channel… But in this case, when only 1 IEM is used – you are risking to get a headache, or worse. Therefore, the best option in such usage would be to use earbuds instead of IEMs. For example, such excellent options as Ourart ACG or Ti7.

Device in use:

Since FiiO UTWS3 is quite sophisticated device it requires some learning of control operations. Initially, you would have to charge the cradle and ear hooks (inside the cradle). It takes time, but all 3 devices take charge simultaneously which is a step up from a previous version where you would have to charge each channel separately. Just wait for all 3 LEDs on the cradle to go off – it means that charging is compete. As soon as the cradle top cover is opened – both ear hooks come into life with auto power on function (power goes off when top cover gets closed) and the initial pairing process starts (center cradle LED flashes white and red). Now you can proceed with Bluetooth device discovery on your source device.

You should be able to locate FiiO UTWS3 L (or FiiO UTWS3 R or FiiO UTWS3 L/R) at this stage and connect to it, responding with “allow” whenever requested. This would result in device pairing with both channels connected at the same time. Compatible sources should report aptX as Bluetooth audio codec currently in use. FiiO UTWS3 is ready from now on. We would also recommend to get FiiO Control app from Android/iOS store to gain full control over this device. This application would allow to:

• check each channel battery state
• check and upgrade FW version
• change button functions
• set idle state power off timeout
• enable and tune EQ
• tweak audio settings and change voice language
• reset the device, clear pairing
• read user guide

By the time of writing this review FiiO has already released the new FW: 0.2.46 which has bug fixes and new volume logics listed in the changelog. The process of upgrading requires that only one channel should be upgraded at at time – means, the second channel should be in OFF state. It takes about 2-3 minutes/channel to upgrade and can be performed with OTA or local FW *.bin file. Further pairing reset and reconnect is also mandatory. Done in the following steps:

1. Place both channels in cradle
2. Press and hold button on cradle for 12 seconds to reset and power off
3. Ear hooks would get back to life automatically in couple of seconds and synchronize to each other
4. Now it is possible to connect again

Other cradle button functions:

• Long press for 3 seconds – enter pairing mode
• Long press for 12 seconds – reset pairing
• Short press – remaining battery in cradle

Indications:

• R and L white LED pulses – ear hooks charging (for 15 seconds with no USB power supply, constantly – with USB power supply)
• R and L white LED pulses go OFF – ear hooks charged
• Central white LED ON for 5 sec after opening top cover of pressing button – cradle remaining battery >20%
• Central red LED ON for 5 sec after opening top cover of pressing button – cradle remaining battery <20%
• Central white LED pulses – cradle takes charge
• Central white LED ON – cradle fully charged
• Central LED pulses white and red – ear hooks pairing in process when in cradle

Left ear hook button:

• Single click:
  • Resume playback
  • Decrease volume
  • Answer call
• Double click:
  • Pause
• Triple click:
  • Activate voice assistant
• Long press:
  • Previous track
  • Hang up
  • Decline a call

Right ear hook button:

• Single click:
  • Resume playback
  • Increase volume
  • Answer call
• Double click:
  • Pause
• Triple click:
  • Activate voice assistant
• Long press:
  • Next track
  • Hang up
  • Decline a call

For both channels when not in cradle:

• In OFF state – press for 1 second to power ON
• In On state – press for 5 seconds to power OFF

Huh… Requires some time to memorize…

As stated in the description, full charge would allow to use each channel for ~5.5 – 7 hours (which is close to real world figures) and the cradle would also allow to fully charge both channels for 5 times.

No problems were met during pairing process, real world usage, charging or upgrading the firmware. FiiO UTWS3 declared functionality seems to be fully implemented and thoroughly polished. Phone calls don’t disappoint either, providing good voice quality and smplartphone-level noise cancelling performance. Buttons do the job as expected and defined above.

Sound quality:

Now, to the most interesting part. Our testing setup would be HiBy R5 Sabre DAP + FiiO UTWS3 + ArtMagic DH3 (15Ohms) IEMs and aptX codec. We would leave out examining sound with SBC or AAC as less capable codecs, not worth of attention if you have already spent more than $500 for the entire setup. Qualcomm QCC3020 chip over AptX, at least, gives you 16bit/48kHz at 384 kbit/s and frequency response 20Hz – 22.7kHz. More than CD quality but not HD yet.

DH3 are hybrid, easy to drive IEMs with only 15Ohms impedance and 105dB sensitivity. It results in ~55mW of power from UTWS3 which is more than enough to squeeze out the appropriate dynamics and volume level. Such IEMs would get very loud, almost unbearable. Anything sensitive up to 50Ohms should be driven adequately.

Since UTWS3 feels quite linear in tuning, there won’t be any accents on either range other than IEMs would produce on its own. In comparison to cable connection, a certain model of IEMs would sound quite similar, with slightly less clarity on treble, slight decrease in overall resolution and texturing. First addresses Bluetooth codec potential that usually strikes the highest octaves, while the resolution suffers from the limited potential of hardware processing packed to a single chip with significantly reduced element base. But this is only in comparison to HiRes DAP as a source. If to compare UTWS3 to a regular smartphone output sound – some of its aspects would even get improved. For example – midbass dynamics.

In overall, UTWS3 lows feel quite collected and contoured rather than deep or extended, midbass has appealing dynamics and power, mids are linear, with moderate resolution and good balance between male and female vocals, lower treble feels calm and delicate while the extension is slightly below the average. We wouldn’t insist that UTWS3 is capable to substitute wire for a quality-aware listener, neither we would say that UTWS3 cannot substitute wire when necessary for any audio fan. Since it doesn’t add any coloration to regular sound of your favorite IEMs or earbuds – it is a good option whenever wires limit your mobility.

Compared to Hidizs H2: completely different formfactor, still portable, much more capable in terms of Bluetooth codecs (aptX HD, LDAC, UAT) but at the same time – more limited in power output and more susceptible to audio lag. Yes, Hidizs H2 has its numerous strong points but FiiO UTWS3 are far better if the usage scenario is portable everyday use. Especially with a smartphone, when you want to answer calls. Sound-wise, both are neutral sources for IEMs and both behave quite similar. H2, of course, has more potential due to HD codecs but cannot drive similar loads as FiiO UTWS3 do.

Compared to ColorFly BT-C1: almost similar to Hidizs H2, ColorFly represents a standalone product with less portability in mind. It is a closer match to UTWS3 due to only aptX codec support and same power output level. It is very neutral, if not to say boring. Mostly designed to be used as a shelf receiver for active speakers. Not a contender for its planned way if use and less appealing tuning.

Compared to TFZ X1: perhaps the closest match of those, but in a formfactor of IEMs with inbuilt Bluetooth receiver. Less universal, limited to only 1 sound character, less sophisticated in terms of functions and much worse during the phone calls. Overall user experience of TFZ X1 is far from ideal – buttons are too small, LEDs are almost invisible, noise cancelling not good. But the build quality is decent, aptX is supported and sound is quite impressive. FiiO UTWS3 definitely wins, thanks to the possibility of connecting different IEMs.

Conclusion:

Perhaps, FiiO UTWS3 is currently the best representative of what Bluetooth TWS product should be like. Polished in a second iteration, free of bugs or limitations, with adequate revised logics – this product provides strong user experience and stellar performance in the most universal formfactor. Neckbands, TWS IEMs, standalone receivers – all would be less capable or portable in everyday use, either not allowing to switch end gear or to perform routine activities in the most convenient way. FiiO UTWS3, with the idea of universal wireless receiver for any IEMs or earbuds, does the trick in a best possible way, providing audio fans with enough quality and regular user with the appropriate level of comfort and functionality. Or the mixture of those, as the most valuable result. We would definitely stick to this product for a long period as the most universal option currently available on the market…

FiiO UTWS3 official page: LINK

FiiO UTWS3 purchase link on Amazon: LINK

FiiO UTWS3 purchase link on AliExpress: LINK

World goes wireless. Despite the resistance of true audiophiles towards it and lower sound quality in overall — most of us would still end up with over-the-air headphones, eventually. The choice between having the best possible SQ and the most convenient type of use is always leaning towards the latter. With the development of the latest lossless BT audio codecs many audio fans would also give up to unravel the wire. For me, personally, listening sessions and simple musical content consumption are two completely different disciplines — first requiring audiophile grade sound over wires, while the other is more about the universal use. Truthfully speaking, after having tried X1 — first BT wireless IEMs by a respected TFZ brand — my search of IEMs for everyday use, content consumption and phone conversations is over…

TFZ X1 available at PenonAudio store

TFZ X1 technical specifications:

• Driver type: Balanced Armature
• Frequency response range: 20Hz — 20000Hz
• Bluetooth version: BT5.0
• BT codecs: A2DP AVRCP HFP SPP PBAP
• Bluetooth distance: ≤20m
• Intelligent noise reduction
• IPX7 waterproof
• Call time: 5-7hours
• Charging case battery: 2600mA
• IEMs recharge in case:  15 times
• Earphones battery: 3.7V 60mA*2
• Charging time: ≤2 hours
• Mic: -42db
• LED light color: Red-blue
• Additional functions: memory matching, automatic interconnection, binaural calls, volume control
• Size: 76x30x45mm
• Weigh: 4.6g

Packaging, design and build quality:

TFZ X1 comes in a white box with TFZ brand  and product name printed in metallic blue at the front. Back side contains product picture, all available color options and your current choice. Box is heavy… Much heavier than you’d expect from a pair of IEMs.

Inside the box there is a layer retaining X1 case and covering the rest of the accessories.

Box contents:

• TFZ X1 IEMs
• X1 case
• MicroUSB -> USB A cable
• 8 pairs of silicone eartips
• user manual

Case is not only for storing but also acts as a charging cradle for X1 IEMs. It is a masterpience from any standpoint: design is beautiful, build quality is perfect, made of annodized aluminum… I can continue this list forever.

This cradle plays an important role — it is the only charging option for X1, provides up to 15 full charges and secures IEMs from damages, scratches or loss. It has foldable structure with smooth functioning reliable aluminum bracket and top cover retaining magnet.

Inner part is made of precisely molded plastic, has special IEM cavities with the magnetic charging pins. Therefore, IEMs are also secured inside the cradle with the magnetic force — charging continues even if the cradle is placed upside down.

Cradle is quite heavy due to 18650 cell (or something similar) under the hood and makes a feel of cold and solid device in your hand. Funny thing that it seems that I love the cradle more than I like the complete product, at least — aesthetically.

X1 shells are made of two parts: plastic top cover and a base. Top cover shares the same color and rough surface with the cradle. Such elements as white TFZ brand name prints, LED indicator, microphone opening + counter mic opening and two buttons per channel are situated there.

Sound output nozzles are a part of the base and protected by aluminum grills. Base also contains 3 magnetic pin pads for charging. Of course, no cable ports are available (wonder when manufacturers would start to use this idea — providing both types of connections — wireless and wired — in the same IEMs).

Fit:

My first experience with wireless IEMs (for example Xiaomi MI Mini) was not that great due to terrible fit. First — I couldn’t find the best eartip or position, worring that I would loose it one day.  It also produced some vacuum effect and caused the headache after couple of hours. Since than, I have decided that wireless IEMs should consit of L|R channels instead of using mono devices and that the ergonomics must be close to perfect. TFZ X1 is a good choice for me. Stock set of eartips allows to have a secure fit, shape is quite comfortable and the weight is totally ok. At least, X1 is not trying to jump out. I have already spent 2 weeks with X1, doing common tasks — no pain, no loss, not even a single attempt to be lost. Having 2 channels solves the problem of headaches when your brain (or third ear) cannot adapt to the vacuum effect on only one side. The only problem that is common for wireless IEMs equipped with the buttons — button press is not that easy and would push the output nozzles deeper inside the ear channels. Good practice is to switch to sensor type button like used in similar AKG IEMs.

X1 in operation:

Charging the cradle takes about 3 hours if IEMs are out or fully charged. There is a microUSB charging port located on the right side of the cradle and small red LED indicator to inform of the status.

Another green|red LED is located inside the cradle, between the charging cavities. This LED informs about the charging state of IEMs. Since the battery in each channels is only 60mAh — charging is done quite fast and IEMs are ready to be used for another 7 hours.

Moreover, it is not necessary to use both channels simultanously. If using it as BT hadnsfree IEM for the phone calls — either one could do the trick while the other rests in cradle. Literally, this doubles the battery life for phone calls and reaches up to 14 hours. And, what is most important — there is a certain software logics behind that: if you take out only one IEM from the cradle — it powers on and connects to your phone in mono mode. If taking out both — both channels would be functional. If you would like to take both IEMs out and use only one — just switch the other one off with the help of the power button located on each of the channels…

Just to summarize possible usage scenarios:

• a set of X1 IEMs could be used for regular stereo audio or binaural phone calls
• either one channel can be used for music or as BT handsfree unit in mono mode since it has own buttons, battery and two mics
• charging can be done simultanously for both IEMs + cradle, separately for each device or in any other combination

Pairing with the regular Android-based smartphone happens very fast, charge level is available in the status bar upon connection, operation is smooth and totally glitch-free. Didn’t notice any problems, unexpected disconnections, radio interference or other bugs during two weeks of heavy everyday use.

Maximum volume level is more than enough in comparison to regular type of BT handsfree units by Jabra, Platronics, etc. BTW — there is a female voice with language options that informs about the working and charging state of IEMs.  Information about switching to different language is located in the user manual.

Working distance that X1 is capable of is ~20m in openspace and ~10 meters in highly crowded office area. That are the best figures that I’ve managed to acquire.

Sound quality:

I would not go deep into details here. Why? Because I treat TFZ X1 as convenient BT handsfree unit with the possibility to play music whenever required. Furthermore, the list of BT audio codec doesn’t include the most advanced ones such as aptX, LDAC or UAT. It means that audio quality would always hang behind good and wired IEMs.

Anyway, the impression about the sound quality is very positive, in overall. Even despite the absence of lossless codecs, TFZ has managed to provide clear, balanced and detailed sound that perfectly hides wireless nature of X1 IEMs. Lows are well-exposed, don’t stand out too much, mids are full-bodied and detailed, treble is kind of limited in extension but still clear and enjoyable. Most of the clarity, detalization and overall balance comes from the choice and tuning of good BA drivers.

Dynamic BT IEMs would usually sound worse due to multiplying the initial flaws of wireless encoding and transmission (interference, noise, limited treble extension, limited resolution). BA drivers, instead, help to mask out most of the problems and provide mostly pleasing experience even for an experienced person with trained ears like me. Haven’t noticed sound being harsh, moody or unnatural. Everything is smooth and enjoyable.

One more important thing to mention in SQ section is the quality of voice calls. TFZ X1 shine in that — noise canceling function work very well in various conditions. Even if you drive a car with the opened window — the other party doesn’t have any problems hearing what you say. At the same time, the voice of the other party is always clear, natural and loud. This is the best BT unit for voice calls so far, if to compare to similar products from Xiaomi, AKG, Samsung, etc. Usually, such devices would suffer much more from voice interruptions, radio interference and other unexpected audio problems.

Conclusion:

What I like about TFZ company is that they don’t try to release raw product before conducting all necessary tests. X1 IEMs is a quite sophisticated and mature product in terms of build quality, usage scenarios, firmware stability and solid user experience. Can’t tell that its main purpose is to satisfy the audiophiles but it perfectly fits the demands of everyday use. Voice calls are clear, noise free and stable. Even the resulting music quality of regular BT codecs is compensated by the rich and detailed sound of high-quality balanced armature drivers. No surprise why TFZ X1 became «indispensable» assistant for me since the first day of use. Surely, this product would carry on helping me out in different situations in future.

TFZ X1 available at PenonAudio store