I got for jl audio tr-570's in my car. i installed the back ones myself..im a newb so i put a few screws in to get them down..not 2 sturdy but w.e. I notice this very annoying buzzing type sound when i turn the bass up a little on SOME songs... its really strange and it pisses me off cuz it only happens during some songs...its like a buzzing kinda noise...only in my back left speaker... HMm!