Daniel, if you do get the M80s, be sure to leave the impedance setting on the Yamaha in the higher position. The lower 4ohm setting simply reduces the voltage output, and therefore the power output is also reduced, with lab tests showing that it's roughly cut in half. This is a required caution in the manual to satisfy UL requirements related to possible overheating, but because of the possible performance limitation it should never be actually put into effect.

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Enjoy the music, not the equipment.