Aftermarket Speakers Rattle

Installed some aftermarket speakers since my other ones sounded pretty bad...I had to cut the housing to fit these new speakers and they sound good except they rattle pretty badly and I was wondering if anyone has dealt with this and can tell me how to fix it. I thought about putting some felt or foam behind the speakers...

 

What rattling? I placed hushmat behind the speakers and around the speaker mount.

 

Basically the speakers rattle whenever I turn them up...part of it is the little cover that goes over the rear speakers, but they rattle even with those off so I think I need some sort of solution to put between the truck and the speakers

 

easy enough to put some sound deadener in that area