Full-scale output -- 2.0V RMS

Frequency response -- 10Hz-25kHz (+/- 0.5dB)

SNR -- (DC to 20kHz) >110dB

THD+N -- (1kHz FS 96 kS/s) <0.002%

Crosstalk -- -110dB

USB transfer mode -- Asynchronous (dual clock)

USB device class -- Type 1.1 or above

Input -- USB Audio

Input bit depth -- 24 bit (upsampled)

Input sample rate -- 32kHz-96kHz - native playback, 188.2kHz, 192kHz - re-sampled to 96kHz for playback

Output -- Analog audio minijack

Output impedance -- 10 ohms

Suggested headphone impedance -- 12 ohms to 10K ohms

Headphone amplifier -- LME49726

D/A converter -- AKM4396

USB controller -- TI1020B

Power requirement -- USB 5V DC, 200mA

USB power filtering -- 2-stage redundant regulation

Product dimensions -- 6.5 x 2 x 1 cm (including USB connector)

Shipping weight -- 1.0lbs (0.5kg)


Operating Temperature: 32 to 95 degrees F
Non-operating Temp: -4 to 113 degrees F
Relative Humidity: 5% to 95% non-condensing

Included accessories

1/8" to 1/4” adapter cable
Product case
Setup guide

D3 Internal Converter

The heart of the D3 is the AK4396 DAC, well regarded for its low noise and high fidelity. Due to the high signal-to-noise specs of the AK4396 and the added benefit of double redundancy power source conversion and filtering, the D3 presents impressive low noise and low distortion characteristics. The D3 can process digital audio at any bit depth up to 24 bits and any sample rate up to 192kHz. D3 pads (upsamples) all bit depths internally to 24 bits, thus achieving a higher signal-to-noise ratio.

D3 Headphone Amplifier

The D3 contains a high-performance headphone amplifier based on the LME49726 low-noise opamp. This amp is able to provide low-impedance, high-fidelity audio and a 2-volt output which easily drives a wide range of headphones, including headphones with impedances as low as 12 ohms. The D3’s relay-controlled stereo outputs can also be connected to any system with an analog audio input, such as Audioengine powered speakers, for example.

D3 Power

The D3 is powered directly from the USB bus and power is passed through two stages of regulation to ensure no USB bus power variations affect the audio quality. This low-noise, low-ripple power supply is located on a separate circuit board for extra isolation and thermal management.

D3 Volume Control

Volume is controlled from the computer’s OS and is implemented in the D3 as a digitally-controlled analog volume control.