Hey, hope you guys can help me. I just bought a Denon AVD M71 unit for a small cabinet. It has 3.1 virtual speaker surround and expandable to 5.1 with a pre-out to supply the center and rear speakers in the surround set up. My problem is where can I find a pre/power amp that is about 15" wide and supplies power to center and R/L rear speakers. Any thoughts!