CO2 (Coaxial/Optical Bi-Directional Converter)

Trying to dub from a DAT machine with S/PDIF coax outputs to another with S/PDIF optical inputs? Got an external A/D converter with S/PDIF optical outputs but an audio card that only accepts coax? Does your external D/A converter appear to be too far from your computer to use S/PDIF reliably? If so, then CO2 will