D3 24-bit DAC/Headphone Amp


  • General specifications

    DAC type

    USB audio

    D/A converter

    USB transfer mode
    Asynchronous dual clock

    USB controller

    USB device class
    Type 1.1 or above

    Input bit depth
    16 bit, 24 bit (upsampled to 24 bit)

    Input sample rate
    48.1kHz-96kHz native playback
    188.2kHz & 192kHz re-sampled to 96kHz

    Analog 3.5mm mini-jack stereo

    Full-scale output level
    2.0V RMS

    Output impedance
    2 ohms

    Recommended headphone impedance range
    12 ohms to 10K ohms

    Headphone amplifier

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

    (DC to 20kHz) >110dB

    (1kHz FS 96kS/s) <0.002%


    Power requirement
    USB 5V DC, 200mA

    USB power filtering
    2-stage redundant regulation

    Product dimensions
    1.9×0.6×0.375″ (48x15x10mm)

    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
    Setup guide
    Product case

    D3 Internal Converter
    The heart of the D3 is the AK4396 DAC, which is 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, satisfying even the most demanding headphone enthusiasts. The D3’s relay-controlled stereo output can also be connected to any system with an analog audio input, such as Audioengine powered speakers.

    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.