Recenlty acquired some RTi A9's for a 7.1 setup (Polk RTi A9, CSi A6, FXi A6 and some old RT3000p monitors in the back) on a Denon AVR-3312ci. I can already tell the A9's are power hungry, much more than the receiver is capable of providing. HT Labs measurements for the receiver:
Seven channels driven continuously into 8-ohm loads:
0.1% distortion at 79.5 watts
1% distortion at 96.8 watts
Yet A9's are rated for 50 - 500w. The question is, where do I begin for amplification. I've got the preouts and I've read a lot about Emotiva Amps. The XPA-2 seems like a nice choice to power the fronts and I've read enough where I'd prefer to go that route for the fronts over the XPA-3 or XPA-5 (plan to add additional amplification for the rest down the line anyway). On the flip side, I've also read that Emotiva is generally considered good entry level, but that there are higher quality used amps out there to do the job for the same price or less.
I found a pair of local used Rotel RB-980BX amps, which when bridged can be 360w mono for about half the entry price of an XPA-2. I know there are more specs to be looking at than just pure wattage, but some insight on some good used amps, either mono or multi-channel, would be much appreciated.
To throw another idea out there entirely, I'm also interested on thoughts about using a tube amp to power these. My listening habits are pretty evenly dispersed between movies/gaming/music.