I'm going to ask another question and you will see why I asked if it affected 5.1.

Do digital receivers output only certain frequencies to each channel when operating in digital surround mode, or do they just output discrete selection of sounds with full frequency coverage?

Do you get the same surround immersion with the M80's as you would with the quad-polar Q's?

50" Panasonic Plasma; VP100; M60Ti; Denon 3805; Infinity sub/rears; HD w/Tivo; Salamander Synergy