For all details/specifications, check out: http://www.us.onkyo.com/model.cfm?m=PA-MC5500&class=Amplifier&p=i
Overall this amp is in fantastic condition with only one minor flaw. I used it to power my 7.0 Monitor Audio RS setup and have since upgraded the entire system. This amp drove my Klipsch THX Ultra2 setup great, but I wanted something with a little more headroom. Used in conjunction with an Onkyo SC-PR5508 pre/pro, this is one of the best sounding combos you can buy right now.