I have the same problem. I've had the speakers for about 4 years w/o issue, and this week the left one started acting like the question above. It's really loud, with speaker excursion like I've never seen, even with bass turned to zero and volume on speaker turned to zero. I've tested and now removed all wires except power, and no change. It is completely unusable. I can't believe no one has answered this question from 2018!!