Yes, I am a dumbass....when I was installing a new dmd display in my NF I pinched the two wires for the backbox speakers in between the ground wire for the display where it connects to the bolt that holds the display in place...now I have no sound from the backbox speakers (cab speaker is ok)... I repaired the wires and checked the fuses but still no sound, just a very low crackle sound... any ideas where to troubleshoot?