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Message: <blockquote data-quote="hispls" data-source="post: 8771282" data-attributes="member: 614752">Would be worth trying the test again on a hot day and cold day to see, but it seems that 31hz + or - 1 will be your sweet spot.Did you find any gains from moving things around (visor, headrests, seats, glove box, etc.?)  How high did you roll up the frequency and how quickly does the number drop off as you go up?  If 31hz is say an 8th wave peak you may have a quarter wave peak at 62 (disable your LPF if you wish to test this).It does look like you found a gain there but that could be just that the meter at the show and this one in the pics are off from each other (not uncommon).</blockquote>

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