HiBy R6 Pro

My background- I am a professional musician, producer and an audio engineer by education, with experience in the performing, recording and pro-audio industry. I test products on a technical and musical level, and try to write reviews as simple as possible from a music fan's perspective.

Disclaimer – The sample was provided for a test and review. I am not affiliated with the company and write this review with my best unbiased opinion regardless of how the review turns out.

Genre preferences- I majorly listen to rock, acoustic, pop and metal genres and occasionally checkout EDM music which is doing the rounds on the radio and charts.

About the product – Hiby R6 Pro is the flagship DAP from the company, Hiby, and sells for $799. I don’t think Hiby needs any introduction here as they are quite famous and successful in what they do. They have an extensive history of developing software and UI, music applications like Hiby Music (which is a killer music player capable of doing things the average Android player can’t) and are now a couple of hardware products old with successful products like their DAPs R3, R6 and Bluetooth Hifi Amp, W5.



In the Box –

1. Hiby R6 Pro
2. Silicone case
3. USB Type-C charging cable
4. Glass guards – 2
5. Micro-SD card tray extraction tool
6. Manuals and warranty cards

Design and Build Quality – I’ve always found Hiby’s designs very beautiful, symmetrical and classy. R6 Pro is no different. It is rectangular shaped weighing around 285 grams. It has fantastic build quality with brushed stainless-steel body, which I absolutely love. The edges are slightly rolled for a smoother look. It has a 4.2 inches high resolution, precisely a 768x1280 screen. The screen is not bezel-less like how recent smartphones have gotten, yet fills up almost 90% of the space. It is covered by Corning Gorilla Glass on both sides, which is a great add-on for clumsy people and gives the R6 Pro a cool glossy look at the back.

• On the top are the LineOut/Coaxial, 3.5mm and 4.4mm outputs.
• On the bottom is the USB Type-c connector.
• On the left are buttons for volume up and down as well as the Micro-SD card tray.
• On the right are buttons for Power (with LED light indications), Previous, Play and Next.

All the buttons are curved in and have very good touch and feel to them while staying true to the design language of the stainless-steel body.




Technical Specifications - This is where DAPs get interesting and it becomes a battle of who can fit the most impressive hardware as well as features. Every enthusiast including me loves checking out every specification in detail and then concluding if the device has ousted the others on paper or not. Well after all a DAP is a culmination of all these tiny hardware decisions working in sync together, so good matching between components is key.

Let dig in deeper….

- CPU Model (SoC) – Snapdragon 425 - Qualcomm Snaprdragon series of processors are the most famous and widely used CPUs for mobile phones and you certainly can’t go wrong with the Snapdragon 425. It is being used by most smartphones around $200-300 and has had the test of time. While choosing a CPU, speed, power and stability are 3 key things and 425 is a time tested good performer in the price range compared to its competition.

- Operating System – Android Oreo 8.1

- Memory - 3 GB RAM | 32GB ROM | 512 GB Micro-SD Card Support

- Sound Hardware

1. DAC – ES9028Q2M * 2
2. MUSES8920 x 4 Low-pass filter chips
3. Empowered by Panasonic Polymer Capacitor with low ESR and Elna SILMIC audio grade capacitors
4. LPF & Amplifier - SSM6322 *2
5. Crystal - Low Phase Noise Crystal *2
6. Japanese Nippon Dics 4.4 Balanced Base for flawless plug and jack connection performance

- Sound specifications

• 3.5mm Single Ended Output

1. Output Power – 245mW + 245mW (32Ω)
2. Noise Floor Level – 3.8uVrms
3. Signal to Noise Ratio (SNR) – 118dB
4. Channel separation (Crosstalk) – 68dB
5. THD+N – 0.0025%
6. Closed Loop Output Impedance – 0.24Ω

• 4.4mm Balanced Output

1. Output Power – 750mW + 750mW (32Ω)
2. Noise Floor Level – 5uVrms
3. Signal to Noise Ratio (SNR) – 120dB
4. Channel separation (Crosstalk) – 97dB
5. THD+N – 0.0012%
6. Closed Loop Output Impedance – 0.28Ω

- Screen – 4.2 inches IPS screen with Corning glass | Resolution – 768x1280 | 320 PPI

With full brightness it looks sharp with good color reproduction. The touch responds very well and there are no ghost touch responses.



- Battery (4000mAh) – Hiby claims that it provides more than 12 hours (32Ω, single-ended) and 8 hours (32Ω, balanced) of music playing under test conditions. *Test conditions: Bluetooth/WiFi/display off, volume at 40, low gain, single loop 44.1kHz 16bit wav file.

- Qualcomm Quick Charge QC3.0 Support - R6 Pro supports QC3.0 charge, which is excellent and claim that it takes only 1 hour to charge 70% of the battery. That claim is accurate in real world tests too.

- Full support for most Hi-Res formats including HD Bluetooth Formats - The HiBy R6 Pro not only supports most Hi-Res lossless formats such as aptX, aptX HD, LDAC, HWA, but also FLAC, WMA, WAV, Apple, LOSSLESS, DSF, and DSDIFF. Native support for DSD 128/256, PCM up to 384Khz/32bit, ISO DSD.




User Experience – Of course compared to smartphones, DAPs are a bit behind in regards to putting in attractive large ultra-high resolution screens but you have to remember that the primary objective of DAPs existing is high quality sound, which is where most of the money goes into manufacturing the device. Keeping that in mind, the UI experience of R6 Pro is quite impressive. It is very smooth, not laggy or sluggish at all. I quickly inserted my Micro-SD card which contains all my songs and started the Hiby Music App. Scanning of all my 5000 songs or so must have taken around 30 seconds. Once set, sifting through the Artists or Albums section is very quick. FYI, I easily get irritated with slow or laggy UIs but R6 Pro does not disappoint at all. The songs play smoothly and switch over to the next song without any lag. Though when using the physical buttons, it does take R6 Pro a fraction of a second more to respond when the screen is off than when the screen is on. It’s because it goes into pseudo standby mode with the screen off.





Google Play Store – Yes it works, giving you full access to all your apps that you want to install. I don’t know about every app but all the ones I wanted to install, installed quickly and ran smoothly.

Battery Life – Initially I noticed my battery draining out rather quickly on standby mode with no music playing. Turns out that it is a small bug with a very easy solution. All you gotta do is grant all permissions to the Google Play Services and the Play Store in the Apps section of your settings. I don’t know if all devices experience this but Hiby should’ve sorted it out with a firmware update. Or maybe there is an odd reason why Google apps don't or can't ask for permission authorization automatically by themselves, like how every other app does when you run it for the first time.

Once done, the battery life for moderate usage is quite good. I averaged around 10-11 hours shuffling between both 3.5mm and 4.4mm outputs. I wasn’t testing under the exact testing conditions mentioned by Hiby in their disclaimer. I guess if I do, I could hit closer to their numbers.

Cool features of Hiby Music worth mentioning –

1. Import music via Wifi – If you have a Mac, you know what a pain in the *** transferring files using the Android File Transfer (AFT) is! That is why I love this feature. Even though I already had most of my music collection on the Micro-SD card, I wanted to transfer the new albums that I had recently bought. I simply entered the URL mentioned by Hiby on the page in my browser, which loaded an interface shown in the picture below. I created a new folder in R6 Pro’s system music folder using the page and selected all the files I wanted to transfer and BAM! It was fast and saved me the hassle of connecting the R6 Pro to my Mac and then having to use that horrendous AFT app.
   
   
   
   
2. MSEB – Whoever has used the Hiby Music app knows that MSEB is a very cool EQ using layman terms, very easy for people who aren’t well versed with the frequency bands in a graphic equalizer. It has sections like - Bass extension, Sibilance, Voice, etc. If you haven’t used it yet, I suggest you try it. I’m sure you’ll be impressed.
   
   
   
   
3. 10-Band Graphic Equalizer – Nothing out of the ordinary here but I’d like to tell you that being a mixing engineer, I use such EQs on a daily basis and Hiby’s EQ works and reacts to gain increments and decrements very well. It’s a very musical EQ.
   
   
4. Hiby Link – Here is how Hiby describes this feature and it is quite self-explanatory.
   
   Control and manage your music files wirelessly with your mobile phone. With the HiBy Link, you can also play the Hi-Res music stored on the R6 wirelessly right on your smartphone.
   
   I synced it to my OnePlus 7 Pro, with OnePlus acting as a controller. Quite cool!

Outputs –

1. 3.5mm out
2. 4.4mm balanced out
3. Line Out / Coaxial – It can be switched from the Settings section.
4. USB DAC – Now this shows R6 Pro can do it all! Being a Mac user, it was extremely easy to set it up. All I had to do was connect the cable, switch R6 Pro to ‘Dac In’ mode and choose R6 Pro as the sound output in my Mac (by clicking the sound icon in the menu bar with the option keep pressed). Done! As easy as that. It works flawlessly!
5. High Quality Bluetooth

Sound Analysis - Keeping it simple without overcomplicating, I’d say that R6 Pro has a very nice organic natural sound. If you see FR graphs of most DAPs these days, they are generally mostly flat. Yet, I’d say that the R6 Pro sounds full bodied, smooth and has good balance. Bass has good reach and rumble, mids are natural and treble is smooth yet clear. It is missing a bit of separation but makes up for it in sounding highly musical.

Timbre & Tonality – Tonality (Harmonics) is switchable from the audio settings though I didn’t hear drastic differences while switching between the different modes. But I want to talk about tonality and timbre of instruments which is very good in the R6 Pro. I can’t emphasize enough that everything sounds very organic and natural, like how well aged vintage instruments sound. Drums shells to orchestral instruments all have accurate presentation. Listening to movie scores and live recordings of symphonic orchestras are a joy on the R6 Pro.

Soundstage – Because R6 Pro has an organic sound signature, soundstage too has a very natural expansion. Clinical sound signatures have a bit wider soundstage but they sometimes lack the organic character which makes everything sound very musical. R6 Pro has good depth giving reverb trails it’s natural space.

Power – As you can see from the specifications, R6 Pro’s outputs are very powerful and will be able to power most of the headphones out there. The balanced out is much more powerful and should preferably be used for headphones with high impedance. On the other hand, the 3.5mm output should satisfy most needs while using regular earphones/IEMs.

Noise Levels in Reality – I’ve tested the R6 Pro with my most sensitive IEMs from Fearless and Tansio Mirai (impedance around 16Ω) and the noise floor is acceptable to me. The noise is majorly heard with low impedance BA IEMs, not with dynamic drivers like KXXS, Oxygen or Kanas Pro. It is low enough that you can’t hear it with music playing at normal average levels. Maybe I’m a bit forgiving having dealt with vintage gear like tapes, vintage microphones and operating noise of consoles in my work but in an ideal world, it would’ve been great if it was a bit lower or even better, not there at all. But if you want high output power and low output impedance, there is going to be a bit of noise floor and you can either learn to live with that or use devices like iFi Audio iEMatch to counter it. I personally don't use the iEMatch.

Sadly, I too experienced EMI interference in the balanced 4.4mm output, like most others reported. Every time I pause the music, I hear digital crackling for a few seconds before the DAC goes on standby. This happens mainly when I’m around the WiFi router or my phone with WiFi on. This can be attributed to the ultra-high output power and very low output impedance. I think Hiby should have sorted this out somehow while beta-testing but nevertheless there is an easy workaround to it - just avoid standing next to wireless connections and signals. Lol!


Conclusion – Hiby’s flagship, the R6 Pro, is a lovely DAP and it has been a pleasure testing it out in detail. It has excellent build quality plus it is very beautiful and classy to look at and hold in the palm of your hands. Hiby also managed to fit in impressive hardware, features and developed a very smooth UI. Hiby Music too is an excellent music player with outstanding features, some of which I use on a daily basis. The high output power and low output impedance specs are impressive and should power most gear flawlessly yet sadly it has R6 Pro picking up EMI interferences in the 4.4mm out, when close to Wifi signals. Nevertheless, my experience of using and testing it in detail for the past month has been great and I find it to be an excellent piece of gear, period! I can’t wait to try what Hiby has in store next but for now, R6 Pro can certainly go into my list of gear recommendations.

You can purchase the Hiby R6 Pro directly from Hiby for $799 - LINK

Specifications



Price: $799.

The HiBy R6 Pro unit here was arranged by HiBy company together with MusicTeck, so credits to both for providing the product for the long review time. On a side note, the review was planned to be uploaded a couple of weeks earlier, so apologies for the delay.

Links:

Official HiBy R6 Pro page

MusicTeck store and on Amazon store

Note that MusicTeck are including an extra 2.5mm to 4.4mm balanced adapter.


The HiBy R6 Pro arrives in a simple and compact all black cardboard box. Nothing fancy on the outside with just minimal specifications on the back part of the box. It is a hassle free unboxing. The R6 Pro player is well placed on the upper box layer inside a small clear bag. The section underneath is divided by single small boxes each of them holding the included different accessories.


The package consists of the standard and necessary items. A USB cable Type-C to regular USB (Type A), a coaxial to 3.5mm cable, a pin to access the memory card tray, a translucent plastic case (maybe of silicone or TPU material), extra screen protectors and extra 'Hi-Res' stickers if you want to feel even more high-end quality. Probably an extra cable for line-out use would have been nice to have, and maybe extra 2.5mm to 4.4mm adapter (note that MusicTeck are including one on the price). As for the included case, it is pretty much standard but yet works well covering the borders and back part of the player. Even though, for the price, and as flagship device, a full leather like case would be have been more appropriate but then you can always get it for the extra ~$30.


Design & Build Quality

The new R6 Pro model is available exclusively in stainless steel finish, in opposite to the original R6 that arrived in two options, aluminum and stainless steel. This may or may not change in the future, but for now the R6 Pro in steel material boast very high build quality as a flagship should be. The silver metal material gives a shiny finish to the whole player, though does also pick fingerprints easily.


Running on the last Android 8 Oreo release, the R6 Pro doesn't look much different than any advanced modern smart phone. The rectangular shape holds the right length and width for a 4.2" display, so smaller than 5" and above phones, but with noticeably thicker, and as expected, the steel alloy material adds even more weight. The corners are nicely rounded and the whole body is smoothly finished.


The layout of all the buttons and input/output ports is well arranged. There are in total five buttons on both sides of the player, all with a same round and concave shape on them for better grip, with similar size and well distant of each other. On the left side are the two volume buttons, and in the middle section a micro SD slot. The micro memory slot is well concealed by the small metal tray which should be opened with the included pin from the accessories' set. The device holds place for only one memory slot, and in theory can read cards up to 2TB; no issues with a 128GB Samsung EVO and small SanDisk cards so far.


On the right side there are four buttons. At the top, the power button which as usual works to turn screen on and off, and also features a small LED light that indicates the charging level and playback, and more interestingly, changes depending the music quality - blue on normal quality and green when playing hi-res files. The LED can be turned off on the settings menu too. Right below there are the 3 playback control buttons, play/pause, next and previous track which also work to fast forward and rewind through the playing track. All the buttons will work on screen off as default and can be disabled by user preference.


The top part has three audio ports, at the left a shared 3.5mm for both Line-Out and Coaxial output, a standard single 3.5mm for headphones in the middle, and to the right the new Pentaconn 4.4mm balanced that replaces the 2.5mm on the original R6. A wise step to use this new output as it is gaining more popularity and more companies are applying it on the more advanced portable players. Worth mentioning that the 4.4mm port has a much tighter grip to the headphone plug than the other two 3.5mm on the R6 Pro.


The bottom section holds only the USB Type-C port. It works for charging, data transfer and also features quick charging. Moreover, it can be used as a DAC or connect to other external DAC.


For the screen, the R6 Pro maintains the 4.2" full touch screen. Just from the specifications you may see the IPS display and Gorilla glass panel, supporting 16 million colors, pixel density of 320 and 768x1280 of resolution. These may be just numbers but nonetheless the quality is impressive in definition, contrast and sharpness, rich colors with good depth. Viewing angle is excellent and screen brightness can reach a high level. It will be smaller than the new advanced smart phones that arrive on wider screens of 5~6" or more, but quality is still great and as any Android device will work nice enough for some games and watching movies.


On the hardware side, the R6 Pro continues to use solid components, starting with the same Qualcomm Snapdragon 425 processor and 3GB of RAM. It may not be up there with top smart phones, but is definitely a strong option to run everything efficiently enough. The response is indeed very fast even handling multiple apps. Wireless quality on both Bluetooth and WiFi navigation is very good with a decent range. The internal storage is limited to 32GB of memory. While at least 64GB would have been more appealing for the price and as an upgrade over the original R6, and even with the micro SD slot you're still limited to just one card; not a major issue, but probably some will find it as a con.
For the audio components, there is the dual ES9028Q2M DAC with MUSES8920 (x4) op-amp chips, a SSM6322 for Low pass filter and another SSM6322 as Amplifier.


User Interface & Software

As an Android based device the R6 Pro runs on the latest 8.1 Oreo platform. For a product of late 2018 and early 2019 it is still the more solid option to get right now, even with the new 9.0 Pie release now available. So basically it looks and works as any Android system with just the extra additional audio settings. The touch screen response is very fast, accurate and sensitive enough, just like using any good smart phone than just a complex Android DAP. Navigation is very simple and most menus and settings options are self-explanatory.

Just to note, the unit here is the international firmware version, 1.1G which has access to Google Play store.

Upon first use, or after every system reset, the device will ask for language and time-zone setting. It starts on the main screen with a few tiles for most standard apps at the bottom. Apart from the HiBy Music app there are no extra apps pre-installed, but can be easily added by Google Play or Apk files.

As usual, below are some of the multiple screens from the R6 Pro:


The main and most complex application is effectively the own HiBy Music App. It has been available for a few years already on both Android and iOS platforms, so those who may want to be familiar can try it regardless the HiBy DAPs. It is quite easy to use with the typical different categories to sort the music files, like by album, artist or genres, and with a standard folders browser. It features a different EQ presets and a wide range custom EQ options of 10 bands that run from 31Hz to 16kHz and go from -12 to +12 dB. However, the most interesting feature is the MageSound 8-ball DSP effects, or just MSEB in short, a rich parametric equalizer that helps to tune and adjust the overall tonality of the music.

To reach the HiBy Music app settings simple touch the left most icon at the top. There can be found a wide list of options, including the HiBy Link, MSEB and USB DAC settings.

And here below, the HiBy Music multiple screens:


MageSound 8-Ball - MSEB


Battery

Like the R6, the R6 Pro uses a same lithium polymer of 4000mAh capacity. The suggested battery performance is up about 12 hours, though the results will vary depending on the music files quality, screen use, wireless features (BT and WiFi), and of course the headphones set used and their respectively volume level. On a normal day with sensitive enough sets, wireless options off and random screen use, the device does hold around 10~11 hrs from a mixed list of Flac files. Not a best time, but still a fine record for a very dedicated audio player. Also, the battery percentage indicator is quite accurate and there are no sudden drops. The standby time is also very good, so no real need to turn on and off the player every time.

The charging times will depend on the charger in use, and as the R6 Pro features quick charging it can be restored to more than half of the battery in around 1 hour. A full 100% charging will take more time though, of around 2~3 hours.



Wireless features

The HiBy R6 Pro offers both wireless features of Bluetooth and WiFi. The Bluetooth is a now standard 4.2 version supporting the higher audio formats including AptX HD, LDAC and HWA. While the newer 5.0 BT version would have been a nicer upgrade in order to compete with the last smartphones, for an audio player is still enough. More importantly, the connectivity has excellent quality with a clean and solid transmission even on a bit more crowded areas. I yet have to try it with some LDAC headphones, but the AptX HD quality is very good. The R6 Pro cannot work as a Bluetooth receiver so there is no option to use it as a portable wireless amp/DAC. However, with the HiBy Link it can be controlled directly from a smart device.

For WiFi, it has a 2.4/5G dual band, and works just as good any decent smartphone should, both for audio streaming or web surfing. At home use it works pretty fast and smooth, but naturally will drop in quality and speed if using a public wireless server.


DAC functionality

Apart from the coaxial and lineout for external sources, the R6 Pro will also connect to an extra DAC through the USB Type-C port. It can be also used as a DAC itself for any PC as replacing the inner soundcard. The performance is pretty much flawless, and just may be need to install extra driver depending on the computer OS.


Sound Quality

Main gears used: iBasso IT01s and IT04, FLC 8N, Custom Art Fibae 3 and Black, Dunu DK-3001 & DN-2002, Periodic Audio Be, Meze Audio 99 Classics, Master&Dynamic MW60, VE ZEN Lite (2.5mm), Hifiman Sundara. Balanced 4.4mm output was used when available through a 2.5mm to 4.4mm adapter.

While the R6 had a very high output impedance of 10 ohm that would not match for sensitive sets, mainly IEMs and specially multi-BA and hybrids, the Pro version apparently has fixed this issue; there is practically no hiss to be heard with any of the above listed gears, but then never found any of them to be particularly picky with other sources. However, it is still quite a powerful portable audio device, and on very sensitive IEMs the sound can be a bit too aggressive with a boost on both bass and treble; a small impedance adapter might be helpful but not really necessary. Moreover, the R6 Pro can get loud enough, so setting a max volume limit is recommended. Also the jumps from each volume step can be a bit too sharp when using IEMs. Unless using more demanding headphones, like the Sundara planar here, the high and low gain options didn't mean more than a small difference in the volume level.


Needless to say that the sound description of any audio source will depend on the headphones used, but going through a variety of gears on different signatures helps to give a general idea of the characteristics, tonality and overall capabilities (or limitations) of the device. While the HiBy R6 Pro features a few tonality selections, the differences are not as noticed as when compared to all the MageSound 8-Ball (MSEB) effects. With all the algorithms, the MSEB can tune the sound presentation to practically multiple signatures. Even so, for the sake of the review, all the EQ options were turned off in order to describe the R6 Pro sound in its 'pure' mode.

The R6 Pro tends to present a very neutral signature with a kind of reference and highly detailed presentation. It doesn't go completely flat but definitely very linear with excellent balance and pretty much no added coloration on the sound. Transparency is a strong characteristic too, though won't be too analytical; this is a good point as dynamics and layering are impressive on the R6 Pro. Despite the neutral tuning it gives a very natural weight to notes and superb separation between instruments that still sound musical for most genres. Speed and control really stand out, especially when paired with some fast multi balanced armatures like the triple Fibae 3. It is also a very revealing DAP with a strong sense of air and forward micro-detailing, and always too effortless. In occasions it can sound just a bit cold, usually when using some warmer or thicker sounding headphones, and despite the overall fullness those looking for more some richer or more musicality might find the R6 Pro a bit lacking in that regard (at least on the single ended output). The sound stage is expansive, very spacious and wide yet very coherent and with very accurate imaging.

Differences between single ended and balanced outputs are not always noticeable on all portable players. Some of them just bring a higher output power while others do show notorious improvement on the overall presentation. Good news, the R6 Pro falls into the second group, showing better sonic characteristics from the SE to the new implemented 4.4mm balanced output. I yet have to try it with a real 4.4mm terminated cable, but even with just a 2.5mm to 4.4mm adapter it is a worth step over the 3.5mm port. It just simply sounds better.

The single ended output brings a more neutral presentation with a most reference tuning. Sound is more flat and pretty much linear from bass to mids and treble with a just tilt of brightness towards the high frequencies. There is a high level of precision and control with almost colorless tonality, and maybe a bit cool and analytical. Bass is neutral in impact with no extra rumble added than what the headphones should allow and it is very fast and tight. Treble has good attack but doesn't get too aggressive as it mostly quite controlled. Extension is very good on both ends, rather natural and effortless. Imaging is very coherent and the presentation very spacious and airy, soundstage has good dimensions, width and depth, but it is more about a greater positioning what the single output is about.

The balanced output keeps all the high sonic characteristics but with noticeable improvements and a bit different tonality. Technically it has more output power which is well perceived on the higher volume gain so usually it works on lower volume steps than the single ended port. The sound is indeed more powerful and strikes with more impact and depth. Speed is higher handling more complex tracks with more ease. There is also extra weight and body on instruments and voices, and while the balanced output seems to have a smoother and thicker tonality it compensates with better layering and separation. The attack remains almost unchanged though there is a fuller impact and more natural decay and depth. Midrange is particularly nicer as the smoother character brings a richer tonality and more importantly a more musical presentation. If the single output was a bit cold then the balanced mode improves that with a more emotion and realism. Treble is more energetic and at the same time more controlled, so despite its more aggressive characteristic it balances better within the rest of the music. The dynamic range is improved as well with further extension, sounding tighter and even more effortless. The soundstage is what really impresses on the 4.4mm balanced mode, gaining more width and height with a very spacious and open presentation still keeping a more enjoyable sense of musicality.


Value

The new HiBy R6 Pro is a very complete audio device. It brings superb build quality now with the stainless steel design in a nice and smooth finish. The probably only one drawback might lay on its extra weight for total portability, though nothing out of the standard compared to modern advanced audio devices and even many smartphones. The interface is well implemented and running on a last Android 8.1 Oreo version gives a very friendly and versatile experience. Moreover, the system runs quite fast and stable, with solid wireless connections on both Bluetooth and WiFi. Battery seems to be enough for daily use too considering all the features that the R6 Pro holds, and the quick charging is a plus. While any music application can be used, the included Hiby Music app is very interesting and specially with the MSEB tuning. Sound wise the R6 Pro is very capable, it is of high quality and powerful, highly detailed and very dynamic. While the single ended output is already impressive, the real deal is the newly implemented 4.4mm output, boosting the sound to a higher level with wide and spacious soundstage, clean timbre and dynamic and so effortless sound.