i think that is alternator noise but i'm pretty sure that happens when there is a bad ground.i had that happen to me b4 n it was my ground another friend of mine had that happen also but his was cause he had a legacy amp n the gain was jacked way up.
oh btw lucas i live kinda close to you n i have no life if u ever wanna come out to swanton i can try n help u with any car audio problems u got i love systems so it would be fun 4 me