Troy, you're concerning yourself unduly over the 4 ohm impedance of the M80 and considering something that might be just a waste of your money. Your ears would give long before the avr 510 would in driving them. The M80 is a very efficient speaker and the avr 510 has excellent 4 ohm capability( note the lab results in the june 2001 Sound & Vision). Buy the other equipment if you want to, but don't imagine that you have to.

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Enjoy the music, not the equipment.