Buzzing from sub?, I'm getting an annoying buzz with my new custom sealed box Options

[Noahwhite2014]

So I made a sealed box that takes up the inside of the spare tire well and has a false floor baffle flush with the rear seats in the down position. The volume on the interior is around 2.85 cubic feet and there is cushion foam lining the floor pan in the back. The whole box is bolted down to the spare tire tie down hole and that is also the ground point I'm using for the amp. Here's a picture of it.

Looks great and sounds great, but at certain frequencies I get a buzz from my plastics in the back. I believe it's also buzzing the bumper and license plate bezel (not the license plate itself since it has a rubber "anti vibration" frame.

Anyone have a good way to quiet that crap down? Lol

[Noahwhite2014]

Lol yeah I just bought that amp because at the time they were out of amps at the bestbuy I work at (lol... So i just ordered that one for like $30 and next day shipping for an extra $13 on Amazon. I planned on getting a different one, but haven't gotten around to it since I'd rather spend the money on other things like new wheels, lowering springs, side skirts, and getting my windows tinted. I mean it works for now I figured with such low frequencies I woudlnt hear any interference/feedback like how you can on an amp and a guitar till you turn the treble down

Edit: we were also out of the comp r 12s so I settled for the comp s 12.

If anyone wants the plans for the box I made I can redo it all an post it. It cost like $60 total but keep in mind this is hawaii prices lol, mdf is like $40 for the 4x8 foot sheets and glue is nearly $10 a bottle. When I discovered liquid nails I realize I wasted a $10 bottle of wood glue lol

This post has been edited by Noahwhite2014: May 2, 2015 - 7:14 AM