i have a question anyone know why this is happing that it seems to be draining my battery so fast if i leave my stereo on for like 20 minutes with car off it will die.also i use to have a pioneer unit before with no problems like this,pioneer was a litlle less powerful though.when car is off but stereo on i turn volume to bout 21 volume sounds fine but when car is on i turn to same volume but this time it sounds poppy crackling sound. ihave stock speakers plus some 12's subs connected with no amp, help please somebody.