Im posting this here because the guys at bestbuy have no idea whats going on. I have a set of high end door and rear speakers in the BKO, when I have just the door speakers playing directly off the the HU they sound like crap because there isnt enough power going to them but there is no interfearance sound. I hooked up an amp to push the door and rear speakers and I get this whinning/whinding sound which the pitch and sound lvl increase when i rev up the engine. I have used 5 different grounds on both the amp and the HU and made sure the power wire and rca cable are ran on different sides of the vehicle. The dudes at best buy said they think its some sort of noise coming from the ALT and it needs to be replaced, any ideas?