Also agree, the 7200 should be fine in that size room. I agree too, you will likely want something between the C15 and the speakers as the digital output of the C15 (if the MC200 is anything to go by) can't do the speakers justice.

Unfortunately, I have no idea about the clamp rings. Would like to know the answer to that myself before I upgrade...

Prolific music listener / Hi-Fi addict!