when i turn on the car the sub pops and when the stereo is down all the way the sub is still pulsing, whats going on? it hasnt always done this-help!

 

The "pop" is a curent being poshed to the amp and causing to speakers to "pop" Or do they do it all the time? Like if you turn the car on and let it idle with the radio down they still "pop".

I know if i turn my radio down but still have it on a little sound still goes through.. Maybe it is that...