Monsoon help

I just swapped a monsoon into my 95 and I'm getting some noises when I turn off the car through the speakers. If I have the key in run (car doesn't have to be on). When I turn off the car "pop" out the speakers. It didn't do it with the stock radio. Any ideas?

You probably have a problem with your ground lead somewhere, check from the harness to the point where its attached to the frame or body somewhere, at some point in there there has to be a problem, your probably just now noticeing it becuase its drawing more current and makeing the pop a bit louder

Thanks! I'll check that out.