Hi GlassWolf, i'm new to this site and was reading some of the articles. It seems that you have a lot of knowledge in electronics:} I was wondering if you could help me out with my problem? I'm putting a system in my car. I have 3 fosgate amps. My problem is that there is a whine in the speakers. When i unpluge the rca from the sub amp it quits. It only whines when the car is running. Any info would be appreciated. Thanks, Steve