Hi Steve, and welcome as member number 8000!

I run my M80s with a Harman/Kardon AVR-525, which is a few generations older than your 247, and they work just fine. As long as you're not in a very large room or pushing high volumes (>90 dB?), it should be just fine. My 525 is rated at 75wpc, if that helps.

I am the Doctor, and THIS... is my SPOON!