Prior to the GRs, I had a 6.1 setup. With the GRs, like Taifun, I actually don't miss the rear center at all. I had the opportunity to buy another single matching A/V-2 for a great price, but I don't have a place to put it in my current setup, but I haven't felt as though anything is lacking anyway. In the right room, with a good setup, I think 6.1 and 7.1 would be a good thing, but still may not benefit serious music listeners. I haven't heard a good example of PLIIx yet, so I can't comment on that, but so far I haven't found a DSP that provided me with a better sound that a well done multichannel mix.
What I noticed is, even with ES material, it is so well mixed usually that even without being processed in ES, the surround content is very good. I heard this recently with
Domino - not the best movie but the ES sound and a good mix was great!
Very busy with work and other things lately. If you need something specific, you can always PM me too
