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Message: <blockquote data-quote="rob420" data-source="post: 8091196" data-attributes="member: 653701"><p>Can Tuning a port lower than what the sub manufacturer recommendation harm the sub? I got a Memphis M515Q1 it is recommended to be tuned at 43hz.  I recently built a box at the required size, but did a port at 35hz, so I could pick up some lower bass (Had the amp set at 35hz).  It worked good for about a week than I noticed the sub slapping.  I turned the amp down and turned the hz on the amp up to 40hz to eliminate the slapping at high volume sounded good, for about 30 min than it fried.  Wondering if the port tuning had something to do with it?  (Amp is a Rockford Power 1500 running at 1 0hm, 1880rms)</p></blockquote><p></p>

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