My 2 10s are making popping noises or similar to that when the car is turned on but when the car is off the 10s sound good. I have the amp currently hooked up to my deck to the subwoofer RCA output and another amp pushin my highs to my deck as well but to the back RCA outputs. The amp pushing my highes are fine with the engine on/off but the subwoofers make a popping noise with the engine on. Anyone know what the problem is? I tried grounding it at a different location but still same thing.