So right now i got sony front speakers and some pioneer rear speakers, the rear speakers rattle my car. If i got a 12 in the back would that rattle even more? I don't have a aftermarket deck if that makes a difference, i'm just trying to bump haha sorry if this is a noobie question.

 

thread moved..

and you will need an aftermarket headunit to properly run RCA outs for a dedicated amp for your 12.

 

Yes, it will rattle.