When i listen to ipod using tape or the radio, once in a while, the speakers would go louder a little bit then back to the vol i had it on. it does it a few times or it would stay at higher vol for awhile. when you put it on lowest possible vol(basically mute) but speakers still on you can hear the music a little bit thats when the vol went up for some odd reason. Im thinking the amp or something is messed up. o yea, stock sound sys es300 97