I have 2 Yamaha p2100 power amps. These are 2 channel amps with 100 watts per channel. They can be bridged to 200 watts at 16 ohms. They have a few scratches but are rock solid. Sound great. One has a slightly scratchy volume knob. Can be cleaned with contact spray. Can be rack mounted. Weigh 31 pounds per amp. Also, the manual can be downloaded at the Yamaha site. Sell both for $350 shipped.