I'm finding that is the problem. The VSX-82 doesn't "support" 4-ohms with its impedence matching. Only 6- and 8-ohms. I've read where I shouldn't use the impedence matching on any amp because it affects the sound. I love the M80's - I wonder why the design choice to make them 4-ohms. Do most receivers/amps support them?

M22v3;VP150;QS8;Hsu VTF3-MK4 sub