Dittos on the sonance 1250. I was at a training there last month, and they did a demo with a 275 that was pretty impressive. They put 5 8ohm speakers on each side of the amp and cranked it up. It got LOUD and kept playing. Just to drive the point home, Ken Manson then took a long flathead screwdriver and shorted out ALL FOUR TERMINALS. The amps internal circuitry reduced output accordingly, but the amp never shut down, and ALL TEN SPEAKERS KEPT PLAYING! Friggin amazing. I know what I'll be spec'ing from now on.