Monarchy Audio DIP Classic - 24/96 Digital Interface Processor (DIP)
A great, inexpensive add-on to any CD or DVD digital system employing separate transport and DAC. Works particularly well with the MSB DAC products. Smooth out nasty digital harshness! Features coax and Toslink inputs, and coax and balanced outputs. Handles 24/96 signals and passes all digital surround formats, including AC-3, DTS, and THX 5.1.
I copied this from the Music direct web site and in my system it did indeed pass DD and DTS. I'm usind a Proceed AVP.