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'm confused with your last statement. Most sub's are set X per sub not per coil and if your sub is rated to handle 300 RMS that's what its rated for. Doesn't matter if you run it at 2 ohms or 4 ohms it still requires same amount of rms. 4 ohms sounds better but also harder to push. Home system guys always go 8 ohms. My sub for an example is 1000 RMS. So I can run it 1/2/4 ohm and do 1k RMS but 4 ohms would sound the best but idk any amp that can push 1k RMS at 4 ohms that's not over 500$+ or run it at 2 ohms @ 1k. Never heard of a sub being rated RMS on different ohms.

It's amp that changed with RMS not sub. My alpine can do 300 RMS @ 4 and 500 RMS @2 its not 1 ohm stable. My Rockford 1000.1d can do 500@4 and 1k@2 ohms its not 1 ohm stable as well.