I got a JL audio 300/4 and a 1000/1 in my 04 Honda accord coupe, and ive had the whine for awhile. I used to have the amps grounded through the same point but then I seperated them. My power wires and my rca's are on opposite sides of the car, so thats not it and its stinger cables and wires so its good stuff. I tried grounding the deck, no dice. But I think I am going to use some shorting plugs to try and isolate the problem further, I bought a gnd isolator and that didnt even work so I was just wondering if a capacitor in some strange way would eliminate the bitch noise.