I haven't had the time to completely look into DPL-IIx but am wondering if it is a must have on my next receiver to be used as a prepro.
The question I have is does DPL-IIx add a pair of rear (back) channels thus making it 7.1 or does it add a 6th channel making it 6.1. (I know these channels are matrixed and not discrete).

My trusted Proton prepro has started misbehaving and I would like to replace it with a Pioneer 914K or something similar. The Pioneer claims DPL-IIx but only has 6.1 channel outs so this has become quite confusing to me. (Never thought this day would come when I would be lacking behind all these advancements in audio.)

While I am currently very happy with a 5.1 setup, I would like the ability of going 6-7.1 in the future provided I have the space.