So in the search to find what was wrong with my 72 twin reverb my buddy said check the speakers. I pulled the grill cloth and everything looked okay but when I fired the amp up at a low volume I quickly realized that the one speaker wasn't playing anything. Of course it had to be my original orange label jbl speaker. The other one is a jbl k120 but that was replaced about 10 years ago and works fine. The speaker that isn't working looks fine, no tears or anything. So is it shot? Or does it just need a repair? I was looking to sell these anyways and get some webers (not a fan of jbl's) but now I'm hesitant to put the one up for sale if its not working. Any input would be great, thanks.