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<blockquote data-quote="hatedonmostly" data-source="post: 6784996" data-attributes="member: 611322">As most of you know, I did a blowthrough recently. Here is a picture:<img src="http://img188.imageshack.us/img188/8196/dscf4064k.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />The box resonates at higher volume, and I can&#039;t pinpoint why. A few things to consider:-The box does NOt leak air at all.-The top, bottom, and sides are only single baffled because the subs are low power speakers, and I didn&#039;t think it&#039;d be much of an issue. However, the sides have all been fiberglassed inside and out.-The box does NOT flex.-The fiberglass bottom of the box is resting right on the sheetmetal of the bed. Perhaps this is what is causing the problem?-There is no bracing in the dead space of the box.Or is this just normal/normal when doing a blowthrough? I don&#039;t hear it inside the car so it doesn&#039;t bother me, but it&#039;s pretty loud outside and I only have two of the four subs in and playing right now, and I&#039;m worried about it getting worse when I add another two.</blockquote>

[QUOTE="hatedonmostly, post: 6784996, member: 611322"] As most of you know, I did a blowthrough recently. Here is a picture: [IMG]http://img188.imageshack.us/img188/8196/dscf4064k.jpg[/IMG] The box resonates at higher volume, and I can't pinpoint why. A few things to consider: -The box does NOt leak air at all. -The top, bottom, and sides are only single baffled because the subs are low power speakers, and I didn't think it'd be much of an issue. However, the sides have all been fiberglassed inside and out. -The box does NOT flex. -The fiberglass bottom of the box is resting right on the sheetmetal of the bed. Perhaps this is what is causing the problem? -There is no bracing in the dead space of the box. Or is this just normal/normal when doing a blowthrough? I don't hear it inside the car so it doesn't bother me, but it's pretty loud outside and I only have two of the four subs in and playing right now, and I'm worried about it getting worse when I add another two. [/QUOTE]

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