I noticed that one of my speakers was unplugged in the back of my 2008 Sammy Back To The Future unit. So I plugged it back in...now its so loud that even at its lowest setting, the potentiometer doesn't bring the speakers down to an acceptable level for home use. Any suggestions? Should I find a way to put a potentiometer on each speaker separately? Or is there a potentiometer with a greater range to it? Any recommendations?