I will be using a nanoAVR DL which is a minidsp w/ Dirac Live built in with my 975. It will be placed between the sources and the 975. It requires a LPCM signal, and therefore will be outputting full 7.1 multichannel.

If i have the 975 setup for just 5.1, will it matrix the rear surround channels into the sides for me? Or is that rear channel content lost?

Thanks for your help!