Obviously, i wasn't there to hear what was going on, so i could be off in left field. Having said that, over-excursion of a mid-woofer can lend a distortion / vibrato effect to midrange and treble frequencies. Don't know if this is what you were hearing, etc... In severe cases of over-excursion, the driver will mechanically bottom out. This sounds VERY scary, as it should. Sean
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