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HiBy RS2: Seek Splendid Sound with New Darwin-based R-2R Digital Audio Player


Editor, Reviews & News
Staff member
Jul 1, 2014
2,577 (0.87/day)
Last year, HiBy released the revolutionary RS6 digital audio player. The player laid the foundation of premium R2R-based Darwin Architecture for portable digital audio players for the brand. Bringing the legacy set by the RS6 forward, HiBy has released the latest RS2 portable digital audio player. With HiBy's in-house developed Darwin audio architecture, RS2 brings the goodness of R2R DACs with modern functions like adjustable FIR filter, Harmonic controller, NOS/OS Switch, etc. It is a pure audio player with the HiBy OS PureAudio version.

There is no Android, just pure musical pleasure awaits you with the latest RS2. HiBy has designed the RS2 with a compact form factor, packing a complete R2R array in a retro design. The player comes loaded with a specially tailored pure OS for a simplified user interface and menu structure. Based on the same Darwin Audio Architecture, the latest RS2 brings the R2R Resistor Ladder Network DAC Array to a more pocket-friendly segment. It is launched officially for $479 and is currently available on pre-order.

Darwin Architecture is HiBy's in-house developed high-resolution audio signal processing technology that brings retro R2R technology with advanced modern features. It effectively reduces the distortion caused by the resistor mismatch in an R2R ladder array producing a clean and natural output. RS2 also features OS (OverSampling) mode and NOS (Non-OverSampling) mode bringing a personalized experience for the users with different IEMs and Headphones. The Darwin architecture here houses a 256-tap adjustable FIR filter. It is capable of up to 16x oversampling with a variety of AA filters like Phase linearity, High-Fidelity, etc.

HiBy has featured an FPGA clock system with precise dual crystal oscillators on the RS2. The RS2 uses 45.158mHz/49.152mHz clocks to reduce phase noise and jitter. The player comes with a high-current mode amplification circuit with an OPA1652 and an LPF circuit with dual OPA1612 chips. RS2 packs a powerful performance with clean noise-free output. As for headphone outputs, the RS2 comes with a single-ended 3.5 mm and balanced 4.4 mm headphone output ports.

HiBy RS2 supports high-resolution PCM, and DSD signals. It supports PCM signals up to 32-Bit/384kHz and native DSD256 decoding. RS2 also supports 8x MQA unfolding offering great performance in the palm of your hands. It can also work as a USB DAC with your system. RS2 also supports line-out/coaxial outputs. HiBy has designed the RS2 with dual memory card slots each supporting up to 2 TB of microSD cards.

HiBy RS2 has got a large 3500mAh battery. It provides continuous music playback for up to 10 hours on a single charge. Standby time is up to 40 days. HiBy RS2 brings the amazing Darwin R2R technology to your pockets in a small and versatile form factor. It's quite a promising device that packs a musical, lively sound signature for its users. The RS2 is available on pre-order now, you can check out more information here.

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Jan 5, 2006
13,169 (2.17/day)
System Name AlderLake / Laptop
Processor Intel i7 12700K / Intel i3 7100U
Motherboard Gigabyte Z690 Aorus Master / HP 83A3 (U3E1)
Cooling Noctua NH-U12A 2 fans + Thermal Grizzly Kryonaut Extreme + 5 case fans / Fan
Memory 32GB DDR5 Corsair Dominator Platinum RGB 6000MHz CL36 / 8GB DDR4 HyperX CL13
Video Card(s) MSI RTX 2070 Super Gaming X Trio / Intel HD620
Storage Samsung 980 Pro 1TB + 970 Evo 500GB + 850 Pro 512GB + 860 Evo 1TB x2 / Samsung 256GB M.2 SSD
Display(s) 23.8" Dell S2417DG 165Hz G-Sync 1440p / 14" 1080p IPS Glossy
Case Be quiet! Silent Base 600 - Window / HP Pavilion
Audio Device(s) ALC1220-VB + ESS ES9118 DAC / Realtek onboard + B&O speaker system
Power Supply Seasonic Focus Plus Gold 750W / Powerbrick
Mouse Logitech MX Anywhere 2 Laser wireless / Logitech M330 wireless
Keyboard RAPOO E9270P Black 5GHz wireless / HP backlit
Software Windows 11 / Windows 10
Benchmark Scores Cinebench R23 (Single Core) 1911 @ stock Cinebench R23 (Multi Core) 22813 @ stock
Not that I need it but I like it, at least this seems better to have than an "ipod".....
Aug 23, 2013
378 (0.12/day)
I kinda feel somewhat bad for people that buy these things. I don't think the difference, if there is one, and inconvenience is worth it.
May 3, 2018
813 (0.52/day)
Money no object I would replace my iPod classic with this for sure, but tthis would be close to $900 in Australia so that's a hard pass. If rural 4G wasn't so pathetically patchy I would have no problems streaming but the quality of the sound of this device would be much better.
Dec 30, 2021
95 (0.42/day)
Do people still use this kind of device these days? looks like a walkman on steroids
Yes, the DAP market has been expanding quite a bit recently. There's a very specific audience of people who want a portable music player that they can listen to while using high-impedance headphones. That audience is growing thanks to the growth of audiophile youtube.

This isn't just audiophoolery either—being able to lounge in the living room, back yard, the park, etc, while listening to music through a pair of hi-fi headphones instead of being bound to wherever your main music setup is, is a novel experience. It's like the music equivalent of taking an OLED TV with you wherever you go. (though this particular player may be more like taking a budget Hisense TV with you—there are some much more expensive DAPs out there)
Mar 20, 2019
504 (0.41/day)
System Name Hermes
Processor 9600k
Motherboard MSI Z390I Gaming EDGE AC
Cooling Scythe Mugen 5
Memory 32GB of G.Skill Ripjaws V 3600MHz CL16
Video Card(s) MSI 3080 Ventus OC
Storage 2x Intel 660p 1TB
Display(s) Acer CG437KP
Case Streacom BC1 mini
Audio Device(s) Topping MX3
Power Supply Corsair RM750
Mouse R.A.T. DWS
Keyboard HAVIT KB487L / AKKO 3098 / Logitech G19
Benchmark Scores Shameful
I kinda feel somewhat bad for people that buy these things. I don't think the difference, if there is one, and inconvenience is worth it.
Well, people who buy these things think otherwise. For them the difference is worth the inconvenience.
Nov 2, 2020
96 (0.15/day)
Sarajevo, BiH
System Name Purple Haze & Red Rock
Processor R5 3600 @ 4125, 4100MHz 1.3V & Xeon E3-1241v3
Motherboard B450 Tomahawk Max & GA-Z87X-UD5H
Cooling Dark Rock 4 Pro, Arctic P14 and P12 case fans & CM 212 Evo led, Arctic F14 and F12 case fans
Memory 16GB Ballistix (Micron E 19nm) 3733MHz 15-20-16-36 67.7ns & 32GB HyperX Beast 2400MHz
Video Card(s) 5700XT Nitro+ & Aorus 1060 6GB
Storage SX8200 Pro 1TB, Toshiba P300 3TB x2 & Kingston A400 120GB, Toshiba P300 3TB
Display(s) AOC 24G2U & Fujitsu P24W-6
Case MS Titan II Pro RGB & Modded CM Q500L
Audio Device(s) Audient iD14 MKII, Adam Audio T8V(x2) & Bloody M550
Power Supply Capstone 1000M & Enermax X't 730W
Mouse G305 & Bloody A91
Keyboard Redragon K530 & Bloody B930
Software W10 LTSC
32-Bit/384kHz PCM, and on a handheld device? And I thought 24-bit/96-192kHz was overkill for most uses. I'll walk myself out...
Jun 2, 2022
42 (0.60/day)
System Name Top Secret
Processor Ryzen 5 1600 AF (aka 2600 lite/Zen+)
Motherboard Biostar "Racing" X470GTQ
Cooling Noctua NH-L9a-AM4
Memory Crucial (Micron) 16 GB DDR4-3200
Video Card(s) low-end (AMD Radeon) Polaris card
Storage HGST/Hitachi UltraStar 7K3000 2 TB | 128 GB Toshiba used OEM M.2 SATA SSD (OS drive)
Display(s) Iiyama ProLite XB2483HSU
Case Fractal Design Define Mini C (wish I had bought something else...)
Audio Device(s) ALC887 -> JDS Labs Atom (headphone) amp
Power Supply Seasonic Focus Gold 550W (GX-550)
Mouse Steelseries Rival 310
Keyboard Cherry G84-5200
Software Debian Linux
At these prices I think I will stick with my dirt cheap used BlackBerry Z10 as DAP... The battery life is terrible but considering what I paid for it and that it can also play video (on a gorgeous 768p/350+ ppi display no less) and has additional features such as a camera on par with the one in the iPhone 4s (okay maybe not that impressive anymore these days but it is still quite decent as far as phone cameras go) and calculator and PDF viewer apps, it compares pretty damn favorably.
Apr 19, 2018
685 (0.43/day)
Processor AMD Ryzen 9 3900X
Motherboard Asus ROG Crosshair VIII Hero WiFi
Cooling Corsair Hydro H115i
Memory 16Gb CL14 Ripjaws V @3666MHz
Video Card(s) MSI GeForce RTX2070
Storage Samsung 970 EVO Plus SSD
Display(s) Korean Unbadged
Case Cooler Master Cosmos
Audio Device(s) O2 USB Headphone AMP
Power Supply Corsair HX850i
Mouse Logitech G703
Keyboard Crap!
An odd device...

Midrange (not bad SNR) 3.5mm headphone jack performance, with very low power output. Why put everything into the 4.4mm output when nothing uses it, and why at the expense of the 3.5mm jack? Get rid of the 4.4mm output, and put a decent amplifier in the 3.5mm. Who needs a balanced output on a portable device, and what actual benefits does it bring, exactly how much audible interference does a 1m headphone cable introduce that necessitates the use of a balanced output?

Only advertising 20-20k +-1dB frequency response, which tells me it's not good beyond that, not that a +-1dB is good in the first place.

Middle of the road output impedance.

Last edited:
Jan 15, 2012
915 (0.24/day)
System Name PC.
Processor i7 2600K 5.0Gh,i7 3770K 5.00Gh. EK, Liqed Coooleng
Motherboard P67A-UD7-B3 Gigabyte T.,ASUS,P8Z77-V PREMIUM,MAXIMUS V EXTRIME..
Cooling Liqed Cooleng ,EK Suprime LTX Nickel,EK for Motherboard,Aqua computer (WGA), Thermaltake .... 0i,
Memory G.SKILL F3-17600CL7-2GBPISG. 16GBSkill Sniper F3-17000CL94GBSR on 2400Hz 10-12-11-29 1
Video Card(s) GTX590 ,SLI ,POV TGT best 691Hz ,LiqedCoold,GTX480.....GTX1080MSI SeaHawkEK SLI
Storage OCZ-REVODRIVE 3-240GB,2xCrucialMX100.512.R-0,1x LMT-32L3m,3x 1TB-WD,1x;1x2TbSEAGATE1x2Tb Seagate
Display(s) DELL-U2412Mb,Samsung Synkmaster245B,HP ENVY 34c
Case Thermaltake, NZXT SWITCH 810SE
Power Supply ENERMAX Platimax 1500W,Thermaltake 1500W
Mouse VIPER V560,FUNC MS-3, Prestigio, R.A.T.E.7 and 5,LogitechG502,RAZER,Inperator.,dead...a.s.o.
Keyboard Trust ....LogotechG410
Software Windows7 64....
Benchmark Scores 3DMark Fire Strike 21.385 (37.234,11.828,7.176)
These specs are worrying, Bad choice of USB controller limits the range mogoče tudi software card reading speed ,20H-20KH , and the dynamic range and crosslink beats even a bad encoder on the cheapest motherboards with the lowest possible power supply noise. Here we have silent batteries ! let's wait for the first reviews .