Use the code OPTOSAVE10 for 10% off your OPTO•DX or OPTO•USB Order
*** Now Shipping with FedEx for Expedited International Delivery ***
SRC•DX USB to DX Bridge

SRC•DX USB to DX Bridge

Regular price $495.00 $445.00 Sale

SRC•DX™ is a revelation for software upscaling: a low RF noise USB to dual-coax S/PDIF (DX) bridge supporting 705.6/768kHz PCM thats fully compatible with FPGA-based upsamplers. Eschewing a direct USB-to-DAC interface means less RF noise is generated by the DAC's USB receiver chip. Low power consumption and electronic filters on the dual-coax output means less RF noise gets to the DAC. This helps elevate the quality of software upscaling so HQPlayer, Roon, and other capable software can sound as good as possible. 

SRC•DX is USB 2.0 class-compliant for plug-and-play operation with Windows, macOS and Linux — powered by the 5V USB port. A push-button selects standard or DX high level for signal compatibility with all DACs. Status LEDs indicate single-coax or dual-coax mode of operation. BNC connections ensure reliable transmission of high-speed digital audio.

SRC•DX is compatible with all PCM upsampling software however HQPlayer's two-million tap 'Sinc-L' PCM filter combined with 15th order 'LNS15' noise shaper are highly recommended. Real-time performance requires only a Core i5 and the extended precision 80-bit floating point available on x64 CPUs delivers 24-bit accuracy.

SRC•DX affords more music lovers the experience of hearing endgame upscaling. Add OPTO•DX or OPTO•USB isolation for a level of transparency that is truly wondrous. 


  • SRC•DX
  • Driver for Windows 10(WASAPI), macOS(Core Audio) or Linux(ALSA) is part of the OS (no need to download a driver)
  • Windows 7/8/10 ASIO driver (Dec 2020) can be downloaded here. Only download and install if required.

HQPlayer Links and Configuration:

  • Download HQPlayer 4.X.0 Desktop here. (Evaluation mode allows easy software/hardware comparison)
  • Recommended filter setting is here
Input Format: USB 2.0 High Speed (480 MB/sec)
Output Formats: S/PDIF (Consumer) - format & signal level
AES/EBU (Professional) - format & signal level
Chord Electronics DX (single or dual coax) - format & signal level
Dimensions (LxWxH): 3.5" x 2.0" x 1.0" (90mm x 50mm x 25mm) 
Shipping Weight: ~0.55 lbs (0.25 kg) 
Power: USB DC 5V @ 50mA