SOtM dX-USB HD Digital Audio Transporter DDC


Yup, another one. The SOtM dX-USB HD Digital Audio Transporter DDC is a ~US$500 box that converts USB to S/PDIF. With offerings from M2Tech, MHDT Labs, Audio-gd and Audiophilleo, this (low-rent) market space is really hotting up.

The dx-USB HD box is externally powered and handles USB data transfer via the much-vaunted asynchronous method – up to 24/192 (so native on OS X but bespoke Windows drivers will be required). Outputs are AES/EBU, coaxial and optical.

Most impressive of all, it’s specified as having two distinct oscillators for 44.1kHz and 48kHz sample rate families.

Wot no I2S?  SOtM already manufacture the SOtM dX-USB USB Digital Audio Transporter DDC (also ~US$400) that trades AES/EBU for I2S, 24/192 for 24/96 and asynchronous for adaptive.

SOtM? “Soul of the Music”. An opportunity missed: given their South Korean location, they shoulda called it “Seoul of the Music”.


  • USB2.0 High Speed, USB Audio Class 2.0
  • 16/24Bit  44.1/48/88.2/96/176/192kHz
  • Asynchronous mode operation
  • Drivers for Windows XP-SP3 (32Bit), Vista-SP2 (32Bit), Vista-SP2 (64Bit), 7 (32 & 64Bit), Native with Mac OSX 10.6.4 or above
  • Indicate LED (Power, Sampling rate)
  • Powered by the USB bus, or external power supply
  • Power regulation circuit  using ultra low noise regulators
  • 400/500MIPS 32bit Multi-threaded Processors (XMOS)
  • Ultra high speed RS422 driver for AES/EBU, Coaxial , Toslink
  • High grade components: PPS film chip capacitor, conductive polymer capacitor, audio grade electrolytic capacitor
  • Dual full size high quality oscillator (one for 44.1kHz family, another for 48kHz)
  • 105x53x150 (WxHxD)
  • Approximately 490g

Wanna buy one?  US$500 via eBay.

Written by John H. Darko

John lives in the NOW + HERE = NOWHERE. He derives an income from the ad revenues of DAR. John is also an occasional staff writer for Stereophile, 6moons and TONEAudio.

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