i am getting some sort of distortion or hissing sound its like a low (CHHHHHH) sound from speakers, i have JBL GTO Compontent speakers with a kicker tc104 sub hooked up to alpine mrp f300 amp. all specs are met with the rms the jbls are 75w rms @ 2ohm the sub is 150rms @ 4ohm the amp out puts 75w rms @ 2ohm and 150w rms bridged @ 4ohm. i tried to turn the gain down on the amp and the speakers still have a distortion and vol is all the way down and on all inputs. any idea what it could be? thank you.