Your AVR25II may not drive the M80's like you may want. I've seen many excellent suggestions on getting an external amp, however, here's another suggestion that is simpler than adding external power. Harman is discontinuing their higher end receivers and there are 2 you can get that would power the M80's quite well, and keep the system simple. The AVR645 and AVR745 are on sale from J&R Music World for 599.95 and 999.95 respectively. Both have very robust amplifier sections (The 745 more so). Just a thought.