Tim, welcome. A little more detail about your room would be helpful. The QSs are really outstanding surround speakers and should be positioned on the side walls maybe 2' farther back than the listening position, or if the the back wall is close, they can be placed there and spread widely, almost to the side walls. In most rooms one of these positions is possible.

The 307 should be entirely sufficient to drive the M80s to safe listening levels and a separate amplifier shouldn't be necessary. Don't assume a problem before you've tried out your setup.

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Enjoy the music, not the equipment.