I have a Fli twin 12" amplified Subwoofer sub bass box and i have it hooked up to my pioneer DEH-2900MP head unit. When im driving the subwoofer and everything is normal but when i begin to stop and put my car in 1st gear the stereo turns itself right down to 0. But it happens every time i slow down and put it into 1st gear. Can anyone help? Do u think it could be too much power for my head unit. post back cheers.