R3 II has a hard limit of, IIRC, 50,000 tracks in the database. You can browse the file system as a workaround, but not all people are okay with that. The R4, being an Android based DAP, does not have that limitation. edit: I know, not an answer about sound quality. Just an important thing to consider. Answer from user_none on reddit.com
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Reddit
reddit.com › r/digitalaudioplayer › hiby r3 ii or hiby r4?
r/DigitalAudioPlayer on Reddit: Hiby R3 II or Hiby R4?
April 26, 2024 -

I recently bought the R3 II (it has some features that I don't really like but it works perfectly fine), and i recently saw the R4 and I fell in love with the design, however I don't want to buy it and leave my R3 to find it's not much of an upgrade so what are the advantages over the R3 (sonically speaking) apart from Android system, is it worth the upgrade?

Rn I'm using the R3 with the Fiio JH5, JH3 and the EPZ Q5, not much of a high end of headphones but they get the job done.

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Head-Fi.org
head-fi.org › home › forums › equipment forums › portable source gear
HiBy R4 | Page 9 | Headphone Reviews and Discussion - Head-Fi.org
March 29, 2024 - The fact that the R4 runs on Android ... and other applications. Sound-wise, I also think that the R4 is marginally better than the R3 II, but not by a long shot....
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Headfonics
headfonics.com › home › dap › hiby r4 review
HiBy R4 Review — Headfonics
February 13, 2025 - Plenty of sound signature tuning options (PEQ, MSEB, Plugins). Good Streaming/surfing capabilities. ... Case is fingerprint-prone and a tight fit. Project Ace Interchangeable jacks are not marked for position and loosen over time. ... The new HiBy R4 DAP has caused some fuss within the community. Is this the replacement for the venerable R3 II...
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Headfonia
headfonia.com › source › portable source › hiby r4 review
HIBY R4 Review - Headfonia
May 2, 2024 - The new R4 is better in every way imaginable than the R3 II in user experience. In sound, these two aren’t much apart, whilst the R4 edges out in transparency and overall resolution.
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Reddit
reddit.com › r/digitalaudioplayer › hiby r3 ii, or new r4 for first dap?
r/DigitalAudioPlayer on Reddit: Hiby r3 ii, or new r4 for first DAP?
September 14, 2023 -

So a little background on me, my parents and I used to run a successful DJ / event coordination company for 20 years. Music has been apart of my life since before I could walk, but I never thought of myself as an audiophile. Recently, after a long break I've rekindled my love for music and want to buy my first DAP to really start enjoying my music and learning more in the world of audiophiles. As of now I own 2 pairs of IEM's, a pair of Astel & Kern AK T9ie, and a pair of moondrop arias. I'm debating on which dap to purchase for my first one. So far my eyes are on the hiby r3 2nd gen, or the new r4. Any insight on which one I should pick? I currently only listen to my phone with a portable dac through tidal. Thank you for any insight in advance!

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Head-Fi.org
head-fi.org › home › head gear › head gear › portable source components › digital audio (flac/mp3/etc) players (daps)
HiBy R4 | Headphone Reviews and Discussion - Head-Fi.org
May 11, 2024 - Pros: Dynamic range User interface Battery Devoid of digital sheen while sounding natural Supports 2tb sd card Transparent and neutral sound Good technical chops Enough driving power from iems to HP Sound shaping (MSEB, PEQ, Plugins) Compact size Price Snappy Android 12 OS Class A amplification Quad ESS sabre Delta Sigma chips · Cons: Not the brightest screen Limited function for FN switch · FOREWORD: The HiBy R4 Calling HiBy is a company that has well and truly proven itself in the audio community.
Rating: 4.6 ​ - ​ 16 votes
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Headfonia
headfonia.com › source › portable source › hiby r3 pro ii review
Hiby R3 Pro II Review - Headfonia
November 29, 2025 - So, it comes down to two things: a smooth, more musical, dynamic sound (R3 Pro II) versus a flat, neutral one (R4), and a much smaller footprint and a much more compact solution (R3 Pro II) versus a full-size, big-screen DAP (R4).
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Reddit
reddit.com › r/digitalaudioplayer › hiby r6 iii or r4 wich one should i go?
r/DigitalAudioPlayer on Reddit: Hiby R6 III or R4 wich one should I go?
October 4, 2024 -

If money is not a problem, which one should you choose between them? R6 III or R4? I just sold my Sony ZX707 Japanese because of the battery (only 4 hours). I was thinking of getting a Fiio M15s, but I don't want Android 10 /11 and it gets hot as well. Astell and Kern SR35 is too small. The Hiby Pro 2 is too big... Dx180 I didn't like the know.

My decision is to pick up one of them R4 or R6 III, by now I have both in my cart waiting to decide 😂 !!!Thank you so much !

Update :

By now , I got the R4 for £170 / $220 in an offer ( half price comparing to R6, to test. I will leave it inside my backpack to use it during commute. I will buy a second dap , probably the R6 but I am afraid that it is almost the same thing as the R4. I can buy something more expensive ( budget is $1200). It will be used at home only . I have saving money for around 1 year to buy a new dap. Any recommendation?

Find elsewhere
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Reddit
reddit.com › r/headphones › hiby r4 review - the boss has lost it
r/headphones on Reddit: Hiby R4 Review - The Boss Has Lost It
May 28, 2024 -

Pros:

  • Price

  • Design and color choices (Reminds me of Evangelion Mechas)

  • Lively and colorful sound

  • Class A amplification

  • Sound customization and enhancement options

Cons:

  • Runs warm

Remember when Hiby released the M300 under a new brand, Hiby Digital? That one was in the same vein as later Sony A Series Walkmans and became quite popular. But that’s old news now. The new rage is the R4. Has Hiby finally lost it, releasing such a feature-packed product for only $249?

Disclaimers

Hiby R4, along with their Project Ace, was sent to me by Hiby as part of the Turkey Tour of the Audio Geek Review Group. I don’t get to keep these tour units, even at the end of the tour. As I always say, everyone is biased one way or another, so take everything you read with a grain of salt. Also, I will try to be more concise and to the point in my reviews from now on without worrying about the word count, etc. If you have any questions, please ask me in the comments, and I will try to answer them to the best of my abilities. Additionally, I will be copying some parts from my earlier Hiby R6 Pro II review, as they are pretty much valid for this review as well.

About Hiby

Hiby was founded in 2011, according to their website, and apparently, has even more experience in the audio field. They are mostly known for their Digital Audio Players, but they also make DAC/Amps and earphones. However, what sets Hiby apart from other manufacturers is their expertise in software. Their UIs, apps, and connection protocol, Hiby Link, are used even by other brands.

Design and Packaging of Hiby R4

With a cyberpunk theme, Hiby hits several birds with one stone. First, they made their target audience obvious, in this case, younger audiophiles. They also lowered the cost with relatively cheap construction and could get away with it. The device has sharp corners, and rubber is used here and there. The 04 number is apparent on the packaging and the device. There are four color choices: Orange, Silver, Green, and Black. The color I got is the most boring one, Silver. Honestly, this Evangelion vibe is what attracted me to the R4.

The Hiby R4 comes in a simple but stylish package. Inside, you are welcomed with the DAP, and at the back, you get a TPU case, a USB-C to USB-C cable, and spare screen protectors. Although it sounds modest, I don’t really need anything else. Higher-end DAPs come with more cables and stuff, but I rarely use them anyway.

Hardware of Hiby R4

So most people choose their DAPs and DACs based on the DAC chips inside. In the case of the R4, 4 ES9018C2M chips are used for digital-to-analog conversion. The amplification circuit consists of 4 OP1652 and 2 OP1612 operational amplifiers. The R4 only works in Class A amplification by default, which can be a downside if you don’t like your electronics running warm or want more battery life. The maximum power output of the device is 165 mW from single-ended and 525 mW from balanced.

Being a budget-oriented device, the Hiby R4 offers 3 GB of RAM memory and 32 GB of internal storage, but as usual, you can store up to 2 TB of music or data with an SD Card.

The 4.7” IPS 720p screen on the R4 isn’t exactly flagship-level, but it's more than enough for regular operation of a DAP.

The R4 supports the usual wireless and wired connectivity options, namely WiFi, Bluetooth 5.0, USB, and Coaxial through USB-C output. Analog outputs include 3.5 mm single-ended and 4.4 mm balanced. There are no separate line outputs. The device also supports DLNA, Airplay, and their own Hiby Link protocols, as well as Hiby Cast remote control. It can render X16 MQA too, if that’s important to you. I’m pretty sure there are others I forgot to mention.

So all of these yield virtually no distortion and noise. I didn’t really test the battery life, but Hiby promises 11 hours of runtime with 3.5 mm single-ended output. All I can say is that the battery has a longer life than my R6 Pro II, so through balanced, I can say 9-10 hours of playback is what you can expect.

Software and UI

The Hiby R4 uses an open Android 12.0, which means you can download any 3rd party apps you want, and it should receive app updates for quite a while. Hiby Music comes pre-installed as the default music player, and I didn’t need to use any other music app since I mostly stream my music.

The UI is customized by Hiby for the intended use case. It is not too different from the usual Android experience, but changing audio controls like adjusting gain and amplification type is especially very easy. Hiby also offers four different themes for you to choose from. All of them looked great in their own way, so I had a hard time choosing one. The UI is pretty fast. I only saw it stuttering when loading album art, that’s all.

Hiby’s own MSEB (Mage Sound 8-ball Tuning) is an EQ-based easy sound adjustment mechanism. If using EQ is intimidating for you, playing with MSEB can ease you into it. I think it’s a great feature. Here is the list that shows how each choice affects the sound:

1 -- Overall Temperature: a tilt of the whole line towards treble (cool) or bass (warm)

2 -- Bass extension 70Hz and below

3 -- Bass texture 100Hz (medium)

4 -- Note thickness 200Hz (wide)

5 -- Vocals 650Hz (very wide)

6 -- Female overtones 3kHz (tight)

7 -- Sibilance LF 5.8kHz (medium)

8 -- Sibilance HF 9.2kHz (medium)

9 -- Impulse response 7.5kHz (very wide)

10 - Air 10kHz sloped all the way to 20kHz

Like other Hiby DAPs of late, R4 also has Parametric Equalizer. There are also plugins you can play with. Hiby sent me some samples to try, like soundstage enhancement and crossfeed. I know some of you like unaltered sound, but when it comes to software, you have got to respect Hiby.

Sound of Hiby R4

I have to be honest; for digital audio players, I value functionality more than sound, unless the device sounds straight up bad, and I’m happy to announce R4 doesn’t sound bad at all. It doesn’t have the sound of a flagship, of course, it doesn’t. But during my time testing it, I never felt like I’m missing something.

The Hiby R4 has a colorful and lively sound. You can say it’s slightly V-shaped. Bass is definitely emphasized, and by a big margin. Other than that, it doesn’t sound particularly harsh or glaring. Details and spaciousness aren’t top-notch, but more than enough unless you aren’t analyzing your music. Let’s move on to comparison for more context.

Comparisons

Hiby R4 vs. Hiby R6 Pro II

I know it’s not exactly fair, but the only comparable DAP I had in my hand at the time of the review was my R6 Pro II. Still, the R4 held its ground pretty well.

  • Bass is more impactful on R4.

  • R6 Pro II is more controlled and well-defined.

  • R4 is more colorful and vivid, just like a contrast-maxed TV. R6 Pro II’s rendition is more natural and effortless. Timbre is also better on R6 Pro II.

  • R6 Pro II has more air, feels more spacious, and separates better. R4 sounds a little blunted compared to that.

  • R6 Pro II is more detailed, which is no surprise. It keeps its composure during complex passages while R4 tumbles a little.

Hiby R4 vs. Fiio KA5

I assume a lot of people will be looking to buy R4 as their first DAP, so coming from a decent dongle, they might be wondering what they will gain, so I compared R4 to my FiiO KA5.

  • R4 has more body and note weight. KA5 sounds cleaner and has slightly better timbre.

  • KA5 has more sub-bass extension.

  • R4 has more energy and bite.

  • KA5 is slightly more airy. Details and spaciousness also feel slightly better on KA5.

Conclusion

The Hiby R4 gets my first full 5 stars. Not because it sounds much better than anything else, but because it does everything I care for right. It has a lively sound that you will enjoy when you are out and about. It has a cool design (Yes, EVA bias). It has great power and amplification. It uses a good processing chip and has a fast UI. It has sound customization and enhancement options like PEQ, MSEB, and plug-ins. And most importantly, it does all of this for only $249. So the verdict? I’m planning to buy a unit for myself later!

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TREOO
treoo.com › home › dap
Comparing HiBy R4, R5II, R6III, R6 Pro II, R8II Digital Audio Players: Finding the Perfect Match for Your Ears (and Wallet)
June 24, 2024 - HiBy R8 II: The flagship of the ... vs. Price: HiBy R4: The most affordable option, the R4 focuses on delivering a clear and engaging sound with a focus on powerful bass....
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Mobileaudiophile
mobileaudiophile.com › home › daps
HiBy R4 Review Mert's Take
November 10, 2024 - That said, for $250, the HiBy R4 ... to other budget-friendly models like the HiBy M300 and R3 II, the R4 brings more features, superior sound quality, and increased power output....
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Mobileaudiophile
mobileaudiophile.com › home › daps
Hiby R3 Pro II Review : Small Size, Serious Performance!!
August 24, 2025 - Of course, you may feel differently, but for me I just think that the R3 Pro II has that fun and dynamic sound, a musical sound, but also a nicely technical sound and all the while the timbre remains natural and organic.
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HiBy
store.hiby.com › home › r3 ii review › r3 ii review
HiBy R3 II (GEN II) Review: Compact DAP with Dual DAC, Touch Screen
March 1, 2024 - The R3 II (GEN II) that I will now review for you is HiBy’s recently released Ultra Portable “Digital Audio Player” (DAP), which is the latest member of the R3 Series. It features two ES9219C chips and supports native DSD up to DSD256 and PCM 384 kHz/32bit audio formats.
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Reddit
reddit.com › r/digitalaudioplayer › [first impressions] hiby r3 ii - hifi audio player with hibyos
r/DigitalAudioPlayer on Reddit: [First Impressions] HiBy R3 II - HiFi Audio Player with HiByOS
February 29, 2024 - Si sì, sugiero que compres uno basado en el sistema operativo Android (por ejemplo, R4, M300), ya que así podrás instalar aplicaciones incluyendo manejadores de podcasts. ... No creo. Solo tienes que conectarlo al ordenador y agregar la música al dispositivo. ... Loving my HiBy R1!
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Head-Fi.org
head-fi.org › home › forums › equipment forums › portable source gear
NEW HIBY R3PRO II - Dual DAC - Longer Battery Life | Page 5 | Headphone Reviews and Discussion - Head-Fi.org
May 28, 2025 - In my case, I have to admit I don't hear any differences between the DAPs I've tried—they all sound good to me, I don't notice any difference. I'm talking about the Hiby R4, Fiio JM21, Tempotec V3 Blaze, and R3 Pro II. In a blind test, I'm 100% sure I wouldn't be able to tell them apart—they all sound really good, nothing to complain about.
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HiBy
store.hiby.com › home › hiby r3 ii 2025 - hifi music player with hibyos
HiBy R3 II DAP - HiFi Music Player with HiByOS | HiBy
R3 II 2025 : A tiny music treasure chest All-new X1600E SoC|All-new intuitive UI|340mW@32Ω High output power|Dual ES9219C|3.2” touchscreen|Self-powered USB audio dongle|Dual independent audio frequency oscillators|Native DSD256 decoding | 32bit/384kHz PCM decoding Upgraded SoC for superb handling Upgraded to X1600E SoC for faster system operations, stronger Bluetooth connections; coupled with all-new user interface, operation is fast, intuitive and a breeze to learn.
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Head-Fi.org
head-fi.org › home › head gear › head gear › portable source components › digital audio (flac/mp3/etc) players (daps)
HIBY R1 - Reviews | Headphone Reviews and Discussion - Head-Fi.org
The HIBY R4 and its collaborative and slightly improved variant, The HIBY R4 x Evangelion Limited Edition are probably their most successful product release in 2024. And now HIBY decided to release a budget entry-level DAP in which will appeal more to the budget- conscious and also taking a role as the new introductory model for all HIBY DAP line-up. This is HIBY R1, this device is somewhat a cheaper option for HIBY's previous entry-level models, the R3 series in which I did a review over a year ago.