yo...i know very little about amps, but i know how to hook a system up. i have a hifonics Brutus BXi 1206D 1200 watts super D-class mono. now recently whenever i turn the amp on it squeals like crazy. it's not coming through the audio, it's inside the amp. when i tap the amp it will go away for a short time, but then it starts squealing again.........what should i do???