Digital to Digital decoder?


Does anyone know of a device that will take in a Dolby Digital 5.1 signal and decode it, outputting as 3 digital (spdif/toslink) stereo signals, i.e. pair #1 is left front, right front, pair #2 is center, subwoofer, pair #3 is left rear, right rear.

I know the Tact TCS can do that, but I'm looking for less expensive, less feature rich alternatives.
bonds
Rare. I have a player that will do it but most such are expensive or custom mods.

What are you going to do with those 3 S/PDIF feeds and how will you control volume?

Kal
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.