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OPTO•DX Optical Isolation for COAX DACs

OPTO•DX Optical Isolation for COAX DACs

Regular price $0.00 $725.00 Sale

Hear your DAC as it was meant to be heard. OPTO•DX™ is the superior remedy for RF noise in a single-coax or dual-coax AES or S/PDIF interface. It works by modulating the coax signal to optical and back to coax over an optical bridge for total optical galvanic isolation. Further, OPTO•DX has independent DC inputs for each side of the optical bridge to provide complete power isolation and reduced noise using battery packs or low noise supplies.

While cleaner sources, ferrite-laden coax cables and other tweaks may attenuate RF noise to the level of your systems’ subjective noise floor, OPTO•DX provides an objectively superior solution for those with the most revealing systems and highest appreciation for musical transparency. With OPTO•DX you will hear a more perfect D/A conversion: a less bright, smoother presentation with more subtle details revealed — and you can listen louder and for longer without fatigue. Less RF noise at the DAC (measurement images at left) is a direct corollary for better sound.

OPTO•DX is configured as a transmitter and receiver linked with optical cables. Choose Premium optical cable for the low modal dispersion of multi-strand fibre (see here). For best RF rejection performance of the dual-coax connection (especially between OPTO•DX receiver and DAC) use a short coax cable and add DC•BLOCK at the DAC connections. For power, AudioWise strongly recommends use of separate power supplies to stop RF from bypassing the optical bridge via the AC mains. Consider a LiFePO₄ battery to power transmitter and receiver or use low-noise, low-impedance LPS (linear power) on at least the receive side of the optical bridge. Download the PDF here for recommended power isolation configurations.


  • OPTO•DX Transmitter Unit
  • OPTO•DX Receiver Unit
  • Two (2) Optical Cables of ordered Grade and Length
  • (Optional) 0.3 meter (~12") Coax Patch Cables
Optical Isolation Whitepaper PDF
Installation Notes
Supported Formats:

S/PDIF (Consumer) - format & signal level

AES/EBU (Professional) - format & signal level

Chord Electronics  - format & signal level

Dimensions (LxWxH): 3.15" x 4.05" x 1.20" (80mm x 103mm x 30mm) each transmitter & receiver
Shipping Weight: ~1.9 lbs (0.85 kg) 
Power: DC 12V to 15V @ 200mA.  5.5mm x 2.1mm connector
Optical Interface:

2.2mm POF on SMA Connectors


Warranty: 1 year return to depot