Hey Guys, First post here. Recently got a Memphis MXA 5.750 installed with 4 memphis 6.5" and a 10" memphis sub. The system sounds great when running off just the battery, however when the engine is running, I get a horrible whine coming from my speakers. I took a video of it and it's on youtube. https://www.youtube.com/watch?v=oP5VXnalziI

The noise rev's up with engine RPM's. I've got 2 batteries and the ground for the amp is on one battery, with the power coming from the other. I did not do the install, and the guys that did have done hundreds before. The ground for the head unit is going to a distribution block behind my gauges. I'm not real sure where the power is coming from.

I really have no idea where to start, so any help would be appreciated. The confusing thing to me is that the system works flawlessly when running off just the batteries, but as soon as the engine is cut on, the noise is so bad I can't even hear music.