Okay, other possibilities include loose internal speaker wiring and M80s wired with reverse polarity. Run M80s alone(no sub, full-range)with bass-heavy music or bass frequency test tones to see if drivers can be seen(and heard)to move.

If the 200Hz result is measured again, Audyssey has detected something wrong(especially in comparison with the VP-180)and this should be corrected, not ignored by turning Audyssey off.

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Enjoy the music, not the equipment.