Before I sold my Onkyo tx-nr1007 I hooked up my M80s to the receiver for the prospective buyer. We had just listened to it through the XPA-2 and I wanted to make sure the amps were OK as I had never used the internal amps. We both immediately noticed that they did not sound as good. I am not knocking the receiver it can drive the speakers no problem. For me the amp made a huge difference and I would not want to go back. It sounded cleaner with more impact, but if my amp did not sound good or shutdown I would return it.

M80,VP150,QS8,ERD-1,XPA-2,XPA-5,UMC-10,PS3,XBOX360,Dish VIP622,PB13 Ultra,Panasonic PT-AE3000U