Hey, this is a question from my friend. He recently installed a pair of 12's in his car with a single amp to power them. Whenever he turns off his car, they emit a "pop" noise. Is it because the headunit is turning off before the amp gets the signal or what? I can't remember what the solution to this problem was.

 

it is the amp. there is nothing wrong with it. some amps have a feature to make it so they wont do that some dont. i cant rmember what its called. if i remember ill let you know

 

It's called a "soft turn on/off." It might be because the HU is turning off its preamp before powering off the remote line.

 

That's "turn off thump". Try turning the volume to 0 before turning off the car.

 

it's the grounding........u need to ground it right....that has happend to my friend's car before i fixed it for him....let me know if you need details....

 

could also be that RCAs are near the power cable.