Originally Posted By: Mad_Chesser
...k, that's good enough for me smile I'll be feeding them power from a Rotel RMB-1095 to start and then eventually was looking at getting a Emotiva XPA-5. I'm quite amazed the price point they hit with 600 watts per channel, at 4 ohm, all 5 channels driven simultaneously...

The XPA-5 is rated 200W @ 8ohm and 300W @ 4 ohm all channels driven. That being said, with a gain of 32 dB and the high sensitivity of the M80s you will never need to reach that power.
The max I ever reached was with the volume at about 6 out of 10 (music) on my pre/pro in a 5000 cubic ft room and it was almost unbearable loud. Very clean sound though; you'll be very happy with the XPA-5 in terms of power.

M80 v3, 2 x Emotiva UPA-1 Monoblocks, XPA-5, UMC-1 PrePro
Pro-Ject RPM Genie, Carver C2 Phono Preamp