Whenever i turn my car on, my subs kind of hits once, and again when i turn off my car.   whenever my head unit turns off, they make a poping noise..  any ideas on how to stop that??
 
Check your grounds and your rca connections.  How old is your radio, some have a soft turnoff feature.
 
 
is it a factory head unit with an loc
 
nothing of my system is stck anymore, i have a jvc head unit, new 500 watt amp, two 12" pioneers.  i have new rockford wiring.   i tried to rearrange my subs in the back and had to disconnect the amp.  i reconnected it, and thats when it started.  thx for the info, i will give it a try and reply back
 
yea their is actually a thing that u can buy that stops this its cheap but i forget what its called, it willl actually hurt the subs if it keeps doing it for awhile.