I need to send audio from a TV to an audio matrix approx 100' away. The TV outputs audio via S/PDIF optical and the audio matrix accepts analog audio.

In the past, I have done this with cat6, using an S/PDIF audio extender to get the audio signal down to the matrix, and then a simple DAC to convert the signal to analog.

However, the only cable I have to work with between the TV and matrix this time is RG6.

I would convert the S/PDIF signal from optical to coax at the TV, except S/PDIF over coax will only go 30' or so.

I think a possible solution is converting the S/PDIF signal to AES3 over coax, which I believe could go the distance. I've never done this, though, and cannot locate the required extender and DAC.

Thoughts?