I recently picked up a pair of kg4 speakers and one of the horns is not working. When I switched the non-working horn into the working side it's still made no sound at all. When I took the working side horn and swapped it into the non-working side it began to play music perfectly. So I know it's not the wiring. What my question is does this mean the horn Tweeter is blown or does it mean it just needs a new diaphragm. I connected the k74 horn to a multimeter and got zero reading again not sure if this means new diaphragm or new complete horn? Any help with this would be greatly appreciated. Cheers