so i just put in a new head unit/upgraded all my speakers/added an amp in the VX and tested it, and it seemed to work great, but as soon as i started her up, i got a nasty whine coming from the speakers that gets louder as the engine gets strained. im guessing that its a ground issue, but i dont even know where to start checking grounds, if anyone has suggestions about where to start/other possible issues please help before i start taking unnecessary peices of the vx apart... only get the whine when the vx is running, sounds crystal clear when its not.. i might also be losing bass when its running.. but not 100% about that (i dont have subs.. see setup)

the setup:

head unit powered by stock power to head unit, split to give power to monitor, used stock head unit ground to ground the main ground and the 'brake' ground (so itll play dvds when the parking brake is off) and remote turn on to amp, no speakers hooked up to the head unit, RCAs out of the head unit (2 pair) go to the amp located under the drivers seat, 5ga power input, 4ga ground to bolt holding drivers seat down, all speakers have been replaced and new wires run to all of them

my RCAs come down next to eachtother down the center console and under the seat right near the seat belt buckle, power for the amp comes on the other side of the drivers seat

there is a moderately sized coil of RCA wire behind the dash because i got 15' wires thinking i was going to mount the amp back with the spare tire

sorry thats a lot of stuff.. but its a big project and i want to be done with it!