Box resonates?

hatedonmostly
5,000+ posts

throwin' hunnits, hunnits
As most of you know, I did a blowthrough recently. Here is a picture:

dscf4064k.jpg


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.

 
The reason could be that the box is on sheetmetal and the box is barely jumping or that the box needs more bracing (or mass loading). I know that my home theater box was 11 cubes and it didn't flex but had resonating panels. I put a hand on a side and it stops.

 
When the bass is hitting it makes a sound just like if you hit the palm of your hand on the box. Not enough bracing? //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 
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hatedonmostly

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