The 811 is loud enough--just wondering if you get better sound with better reciever--like does one do a better job of surround sound--or a wider freq range. For example,if i got a higher end reciever,and played the same dvd at the same level from each reciever-would ther be a diff? Or is the surround aspect completly seprate from the reciever and just past through from the dvd player?