Digital to Digital decoder?

I've got 3 digital amps from Tact that take a spdif signal as input. They have their own volume controls. Right now I'm going from a mac mini to usb adapters to spdif to the amps and that works fine, but it restricts my choice of software to those that can decode 5.1 and route the resulting signals to the 3 audio adapters. I'm also not certain how the signal quality is being impacted at each step from 5.1, to decoded, to usb, to spdif. Would like to pipe out the unmolested 5.1 source signal to a box that I know is doing the right thing.

OK. What is your source connection? Is it S/PDIF with lossy multichannel (like DD) or is it something else?

Kal

Source is SPDIF Dolby Digital 5.1, so need the decoding but would like to keep signal in the digital domain from decoder to 3 stereo SPDIF pairs.

That is a tough one. For a USB output, my modded Oppo would probably do it. For S/PDIF, I am at a loss for anything other than an expensive processor like the Tact, Meridian or Theta.

Anything else is a custom job.

Kal

Hmm, USB output would work if the driver supports 5.1 passthrough in OSX. Can you tell me more about the Oppo?