I have a whine sound i my front speakers, sorta like an alternator whine . It get a little louder with motor rpms. But here is the odd thing, it only does it when car is really hot and when i take it out of garage and its hot. If its night time or cool outside and car has been seting outside no noise. Any ideas on what it could be? oh and its only two of the four channels on the amp making noise.