noise in sound system

Hey all, Lets start by letting you know what system I've got: Pioneer DEH-P7950UB (headunit) 200w Fusion splits in the front 200w Fusion 3-way speakers in the back 1000w ebay amp (khormoah) or something of the sort,(powering the speakers) (2x 30amp fuses) 1200w max boss sub 300w max boss audio amp (powering sub) (2x 15amp fuses) 8ga to a disto block then both 8ga to each amp 8ga ground cable Stock speaker wiring 90amp alternator all installed in a Mitsubishi lancer ce Atm when i turn my ignition on and listen to music, its fine no excess noise, once i start my car theres a faint whine(i guess you could call it)which is in tune with the engine's rpm, e.g when you rev up it gets louder. It has gotten a bit worse since i replaced my 220w pioneer 3-way front speakers with the splits. I've tried earthing the RCA leads due to the pioneer HU problem, that just made the noise worse, I've unplugged the HU all together so its just amp and speakers and the whine is still there with just those 2. my alternator has three suppressors on it, and that hasnt reduced it any, the only other things i can think of are a ground loop, alternator isn't big enough or the flee market amp is on its way out. I plan to upgrade the big 3 in a month or so when money prohibits to see if that might fix the problem. I've put up with this noise for a few months now doing small things now and then to try and eliminate it, but I've had little to no success So does anyone out there have a possible suggestion as to what could be causing this noise? any help would be great, thanks Regards Chris P.S please let me no if you need any more info to help.

bump, anyone able to help?

Have you tried turning the gains down on the amps?

nope, I'll try that tomorrow, thx for the suggestion

Agreed being all swap meet brands there probably is a bad ground in there somewhere and your picking it up in your amplifiers because there cheap and have poor filtering. Not trying to diss on your setup or anything because everyone starts some where just throwing out suggestion on what i have seen that could possibly cause this noise but surely do what green said and measure the resistance. There's a thread on how to do it.

Does the whine change with the rpms of the engine at all?

yeh, it does, its really noticeable just before gear changes (guessing coz thats at the highest rpm)

try this. every pioneer deck i had alwasy gave me this issue. The rca connections, make sure the outer part is not exposes as it picks up noise. My friend has the same issue and what he did was ground the outer spart of the RCA right to ground by a wire, solder and a bold. No problem after he did that.

turning the gains down got rid of it, but i might make sure the rca leads aren't exposed either, thanks