Re: How to tell if you have a cracked speaker
I had a problem with a vintage 15" Jensen from an old Gemini VI amp: it was giving a fluttering sound with certain bass frequencies but I couldn't find any obvious tears. I noticed that if I put pressure on the "spider" (the flexible, ribbed connection and cover between the rear of the cone and the coil/magnet housing) at a certain place, the fluttering stopped. So, as a temp fix, I taped some springy wire pushing a small piece of foam into this location. This took care of the problem. I couldn't find a tear in the spider, but it's hard to see around the metal framework. Maybe there's a weak spot that has caused some sort of resonant vibration to show up... dunno.