@ Chris - Thanks! I suspected there might be more potential interference problems using long runs from the pre-outs.
@ Mark, Chris & Murph - It's definitely music coming from the center M22 but it's very faint. I'm off this Friday so I'll see if it happens again and try to find the source.
The first time I heard it I thought it was coming from outside but when I walked to the various windows it got softer. I finally figured out it was the center speaker. I didn't give it much more thought since it was inaudible with anything playing. However, it may become a factor if I run long wires from the pre-outs.
@ Michael - If I do buy a separate amp for the front speakers it will likely be something like the XPA-3 so it can power all 3 M80s. That's why I'm so interested in how it works out for your M80s. Though it's looking like I won't be needing anywhere near that much power so now I'm looking at what other amp specs and design factors might play a more important role in my situation. I'm sure I will have more questions about that.
3M80 2M22 6QS8 2M2 1EP500 Sony BDP-S590 Panny-7000 Onkyo-3007 Carada-134 Xbox Buttkicker AS-EQ1