goldwing amp help
 

i have the bazooka amp with the plug and play harness,the problem is i keep blowing the same rear left speaker.i have the j&m speakers in front &rear.i have blown 2 allready & have now changer to polk 501 and i'm starting to hear the same again from the same left rear speaker.the gain is at 1/2.also i don't know what to set the switch at (it is currently set to the right) any help would be great! BOB