Digital to Digital decoder?

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?

Sorry. It will only handle FAT/FAT32 USB drives, not the output from a computer.

Kal

I seem to recall from a conversation with one of the engineers at Audio Precision that Dolby is really idiosyncratic on some of the types of digital encoding/decoding and input/output capabilities that they will allow manufacturers to have on their equipment and still be in compliance with Dolby's licensing requirements. This was the reason that Dolby Digital testing is handled differently on AP's newer APx units, versus the earlier implementation on the 2700 series.

Dolby's own commercial cinema units of course have this as an option, but that's definitely not a budget solution. As Kal points out, you might have to go to a modified unit . . . I think that MSB Technology may be able to provide this as a service. Also keep in mind that you'll need to keep the volume synchronized between the Tact units for accurate level calibration -- you might make sure that they will do this on their own even without Tact's companion surround processor.