COS Engineering - D10



“A five star 5-in-one component”

SKU COS_D10_Multi Categories ,

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The updated Version 2 of the D10 is now available, and has already won another Blue Moon award from 6 Moons.

Originally launched in 2020 the COS Engineering D10 is a 5-in-1 masterpiece that has already won a number of accolades from the industry writers.

The COS D10 is a feature rich component of the highest quality. It is primarily a DAC and Preamplifier using the proprietary algorithms developed by COS in their original flagship D1. Add to this a high quality headphone amplifier and the standard model is a versatile component in its own right.

Building on its versatility COS have also added two bolt-on modules that can be purchased at a later date, if required, and easily fitted by the customer. These are a streaming module and a phono board.

All in all the COS D10 is a 5-in-1 component that incorporates a high level of future proofing with its modular design.

COS algorithm, buffer and re-clocking:

The COS proprietary algorithm with a linear-phase delay FIR filter can up-sample original data to 176.4K or 192K. The D10 stores digital data in a one second buffer before converting to analogue signals, under the coordination of a crystal oscillator with a jitter precision of less than 1ps and a dedicated re- clocking circuitry.

MQA (Master quality authenticated):

The D10 includes MQA technology, which enables you to play back MQA audio files and streams, delivering the sound of the original master recording. ‘MQA’ indicates that the product is decoding and playing an MQA stream or file, and denotes provenance to ensure that the sound is identical to that of the source material. ‘MQA.’ indicates it is playing an MQA Studio file, which has either been approved in the studio by the artist/producer or has been verified by the copyright owner.

Headphone amplifier:

The D10 is capable of driving headphones of high and low impedance. It has a pair of 3-pin XLR connectors that accommodate 2 unbalanced headphones or a single balanced one. An extra 4- pin XLR connector is included for balanced headphones.

Streaming module (optional):

Stable and quality streaming is available (either hard wired or wireless) for Tidal, Spotify, Deezer, and Qobuz. It is also DNLA and UPnP compliant. Setup is easy with the MConnect iOS and Android applications. The streaming module in D10 also takes care of MQA decoding.

Phono amplifier module (optional):

There are 5 loading resistors and 3 loading capacitors, all selectable, to accommodate phono cartridges of your choice. Other features include a JFET input stage, on-board low-noise linear regulator, and handpicked components for RIAA curve matching and zero capacitor between audio signal paths. Extremely low in noise and distortion.

Additional features:

Two-layer housing – The D10 has an NCT internal chassis and an aluminium exterior. This design provides a fortified frame that results in lowered noise and minimised interference.

Dual power supply – The D10 uses two-stage regulation to provide clean power. Two toroidal transformers power the digital circuit and the analogue circuit separately, thereby eliminating possible interference.

Analogue input – There is both a balanced (XLR) and single ended (RCA) analogue input

Remote Control – Stylish, ergonomic, and manufactured specifically for the D10



Analogue Input: Balanced X1, Unbalanced X1

Analog Output: Balanced X1, Unbalanced X1

Residual Noise: < 2uV (-114dBV) (20Hz~20KHz, non-weighted, input terminated)

Input Overload: 16V (balanced), 8V (unbalanced)

Input Impedance: 100Kohm

Output Impedance: 200 ohm (balanced), 100ohm (unbalanced)

Maximum Output: 16V (balanced), 8V (unbalanced)

Frequency Response:+/-0.1dB, 20Hz~20KHz

THD+N: < 0.001% (-100dB) (20Hz ~ 20KHz non-weighted)

Signal To Noise Ratio: > 110dB, 20Hz~20KHz non-weighted

Crosstalk: < -120dB

Volume: Precision resistor array, 140 steps by 0.5dB/step, -64db to +6dB

Headphone Amplifier: audio jack X2 (unbalanced X2), XLR-3 X2 (balanced X1), XLR-4 X1 (balanced X1)


Digital Inputs: USB X 1, Asynchronous Audio Class 2.0, SPDIF BNC X1, AES XLR X1, Toslink X1, I2S X1 (HDMI, differential)

Sampling Rate: PCM up to 192Kbps 24 bit, DSD up to DSD256 (USB), DSD64 (all other inputs)

Frequency Response: +0dB, -0.5dB, 20Hz ~ 20KHz

Full Scale Output: 2V (unbalanced), 4V (balanced)

THD+N: < 0.001% (-100dB) (192Ksps, 24-bit, 20Hz ~ 20KHz, A-weighted)

Signal To Noise Ratio: > 110dB, 24-bit, 20Hz~20KHz, A-weighted

DAC: 24-bit DAC X2, up to 192Kbps, 24-bit

Digital Filter: COS proprietary, linear phase delay

Audio clock jitter: < 0.1ps


Gain: 40, 50 or 60dB

Input Resistance: 47 Kohm to 10 ohm

Input Capacitance: 0 to 750pF

RIAA response:<+/-0.2dB/20Hz~20KHz

Residual Noise: <30uV (input shorted, 40dB gain, 20Hz~20KHz) <300uV (input shorted, 60dB gain, 20Hz~20KHz)

THD+N: < -90dB (40dB gain,470ohm load, 1KHz, 2Vrms output) < -70dB (60dB gain,470ohm load, 1KHz, 2Vrms output)


  • DLNA 1.5 & UPnP AV1.0
  • Ethernet 10/100 Base-T
  • Low jitter TCXO 25MHz crystal
  • WiFi, 802.11 ac/abgn
  • ROON ready and tested
  • Tidal, Deezer, Qobuz, Spotify, MQA full decoding


Display: 256 * 64 White OLED

Weight: 10kg

Dimensions: 415mm (W) X 280mm (D) X 100mm (H)

Power: 100~120VAC or 200~240VAC selectable Normal Operation < 50W, standby < 0.5W

Demo unit with streaming module and phono input now available for home demo*

*Terms and conditions apply