HiBy RS2 R2R PureAudio Player 2

HiBy RS2 R2R PureAudio Player

The Darwin audio architecture is HiBy’s in-house developed all new hi-res audio processing architecture; improving greatly upon traditional R2R technology, it incorporates a host of studio-grade functionality such as linearity compensation for the R2R network, adjustable FIR filter, harmonic controller, NOS/OS switch, etc. in a highly portable device.

HiBy RS2 R2R PureAudio Player 9

NOS mode is non-oversampling, yielding raw response to signal changes; OS mode is adapted to the various additional functionalities of the Darwin architecture, realizing personalized adjustments to the sound qualities to adapt to different earphones and different tastes.

HiBy RS2 R2R PureAudio Player 10


The Darwin architecture is capable of up to 16x oversampling, with a variety of AA filters suited to various design goals, e.g. phase linearity, and high fidelity; also adaptable to the characteristics of different earphones, guaranteeing the suitability of the RS2 to all sorts of earphones.

HiBy RS2 R2R PureAudio Player 4

Dual precision crystal oscillators at 45.185MHz / 49.152MHz effectively reduce phase noise and jitter to -140dBc/Hz@1kHz offset.

HiBy RS2 R2R PureAudio Player 8

Utilizing current mode amplification, the output stage amplifies current via an OPA1652 and an LPF consisting of 2x OPA1612, offering high and clean input voltage and current to the output stage for exemplary transient and dynamic response. In conjunction with 2x flagship class OPA1622 amplifier chips, 4 independent channels of current mode headphone amplification, and the professional digital volume controller NJW1195A, the circuit guarantees maximal fidelity of the output to the input and maximal control over the headphone drivers.

HiBy RS2 R2R PureAudio Player 11

The RS2 may be used as a USB DAC (e.g. playing computer/smartphone audio) but also output to other USB DACs (e.g. outputting audio from the RS2 to other USB DACs), and even output its audio as coaxial digital / line out signals.

HiBy RS2 R2R PureAudio Player 12

With slots for 2 micro SD cards, supports storage of up to 4TB and simultaneous usage of the two cards.

HiBy RS2 R2R PureAudio Player 7 e1659619495890

Up to 10 hours of continuous playtime. Standby for up to 40 days.


Model HiBy RS2
Operating system HiByOS PureAudio version
CPU X1000E
DAC Darwin Architecture
Audio format support PCM384 / DSD256
Display size 2.45”
Touchscreen Yes
Resolution 480*360
Storage – card slot 1 Micro SD card up to 2TB
Storage – card slot 2 Micro SD card up to 2TB
Chassis material Aluminium alloy
Dimensions 90.3 *64.8*18.8 mm
Weight Approx. 158g
Charging 5V⎓1.5A
Battery size 3500mAh
Charging time Approx. 3h (0%-100%)

Audio specifications

HiBy RS2 audio specifications (as tested within the 20Hz-20kHz range)

Output port 3.5mm PO @32Ω 4.4mm PO @32Ω 3.5mm LO @10K
Frequency response +/-1dB 20Hz-20kHz 20Hz-20kHz 20Hz-20kHz
Output voltage 2Vrms 3.2Vrms 2Vrms
Maximum output power 125mW 320mW /
Rated output power (THD <1%) 125mW 225mW /
Crosstalk rejection 63dB 82dB 82dB
SNR 118dB 117dB 116dB
Dynamic Range 82 82 /
THD+Noise 0.006% 0.006% 0.006%
Output impedance 0.47Ω 0.94Ω 10K

Price: 479$