I know I'm way late to this party Alex, but I think a used 2 channel amp would really open those speakers up and take a load of the AVR. You can find Adcoms and Carvers all day long for $350 - $400, that will push between 3-400 watts into 4 ohms. The Carvers can also help tame bright speakers as the M & TFM series are modded to sound like the Carver Silver 7 tube monos. You'll probably never use the last 3dbs of headroom, but it's nice to have. I'm also of the opinion that once you start using separate amplification you probably won't go back.