My tri-amped vintage JBL/Crown system failed with a sudden massive noise out the right speaker side. Imagine a smoke alarm battery warning buzz multiplied by about 10000. The 15" D130F woofers and 077 slot tweeters survived because their power amps were fine, but the LE85 midrange driver lost 6 db or so in volume relative to the left side. We've tried adjusting the Rane crossover and replacement power amp settings, as well as swapping cables and channels, but something significant has changed in the LE85.
Is a serious drop in volume typical of diaphragm/coil damage from this type of amp failure? I would have expected heavy distortion instead. But perhaps that's because I've only heard blown out woofers in the past. I can replace the 2420 diaphragm with a JBL D162421, but I would like to be more certain that this is the problem before I order it.
The next question is: if I have to replace the right LE85 diaphragm, should I plan on replacing the diaphragms in both sides for consistency? All the components are 40 plus years old and have been used as our home sound system. Thanks for any advice.
Is a serious drop in volume typical of diaphragm/coil damage from this type of amp failure? I would have expected heavy distortion instead. But perhaps that's because I've only heard blown out woofers in the past. I can replace the 2420 diaphragm with a JBL D162421, but I would like to be more certain that this is the problem before I order it.
The next question is: if I have to replace the right LE85 diaphragm, should I plan on replacing the diaphragms in both sides for consistency? All the components are 40 plus years old and have been used as our home sound system. Thanks for any advice.