Well, no further checking tonight, apparently, so if the unlikely bad speaker cable or bad M80 internal woofer wiring doesn't fit, then next comes the 7200 settings. As was said, if you set the M80s "small", then none of the lowest bass goes to them even if you turn down the volume on the sub. If, on the other hand, you set the M80s "large" then all the bass should go to them, but you said it was just a little better that way?

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Enjoy the music, not the equipment.