Just to add my 2cents. Bigjohn is right. I have the 601 with a VP150, M22tis, and QS8s. I have never had a problem. It does got pretty warm, but never to hot to touch. Just make sure you have 'room to breath' above the receiver and you should be fine.

jr

"What can be asserted without evidence can also be dismissed without evidence." C Hitchens