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Message: <blockquote data-quote="thch" data-source="post: 1900067" data-attributes="member: 562032">one simple subsonic filter method is to play a low frequency sweep -- 20 to 30hz.  set the subsonic filter all the way up at max (40hz?) and lower it.  if the woofer starts distorting, or overexurts, then you've gone too far.  you might want to lower the gain to get a lower subsonic filter frequency.  this solution works better for sealed boxes.of course if the woofer can destroy itself from overexurting before showing other signs of overexcursion, you may be out of luck.  a solution might be to place a soft object or use a laser pointer shown at the cone to get an estimate of distance traveled.</blockquote>

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