HI I have just bought an AVR 360. As long as I use it on a B&W CM 8 or KEF R500s, I am happy with the output. I have never tried it on a really big B&W type speaker, so do I have anything to fear in case I go in for B&W 804s, or KEF reference series (I will buy them used). The speakers will be used in a 5.1 set u - with a PV1D subwoofer, CM1s, and a CM centre.
My room size is an average London room, think 16ft * 18ft.