I got a amp from my buddy.. its an alpine 3553 4channel... I hooked it up today and when i have my volume all the way down it beeps... not like BEEP BEEP but like det.det.det.det.det.det.det.det (use your imagination) any have any idea whats wrong?

 

bad ground
gain too high
alternator noise
rcas ran near power cable

just some thoughts