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

[Jmk91]

I love the way you have that box set up. Looks amazing besides that boss amp... That's problem number 1. They are probably one of the worse audio brands along with power acoustic and fusion and all that stuff. I have a 12 ported tuned to 32hz I'm running 1000 RMS @ 2 ohms I hear the rattle as well. So I ripped out all the plastic in rear and everything went away. Its a trunk that no one sees so why not rip it all out. Easier and netter than listening to it rattle. But if your in the market for a better amp I'll sell you an alpine MRV-m500 its 300 RMS @ 4 ohms and 500 RMS @ 2 ohms. Actually its 524 @ 2 ohms according to birth sheet for 90$ shipped it sells for 130-150 new I just upgraded to a Rockford 1000.1 is all. Its all the vibration from the sub there isn't much you can do actually. My bass hits so hard it flexs the backseat plastic I can see it move haha. Oh well it doesn't make any noise at least.