I am currently using an HK 520 which I am using to power my mains, center, and rears. I am about to purchase a 2 channel amp so that I can do 7.1 I will be reassigning channels so that the added amp will push the mains. Here goes...Can the HK 520 receiver really do 6.1 or 7.1? I know it doesn't really have decoding for it but if you have it in 5.1 DD mode (with a dvd) will a mono signal come from the added side surrounds or will they be silent? If the dvd is DTS encoded, what will happen then? What are my options for making a 6.1 or 7.1 working with this simulated setup?