From: someone@anywheret.net   
      
   "JimD"  wrote in message news:2017100619481977042-email@nowherecom...   
      
   > JBL EON 315, horn driver blown.  We have two of these. We use them as part   
   > of our FOH system, and sometimes just the pair on small duo gigs. That's   
   > what happened today.  We were doing a nice duo thing, sound was odd.  The   
   > speakers were set up, on on each side, used as both mains and as our stage   
   > monitors. The one on my side was a bit muffled.   
      
   > We swapped out both cabs with my smaller Peavey PR10's that I happened to   
   > have in the van. Sound was fine then.   
      
   > Got the EON home, opened it, got the driver model number, ordered two new   
   > ones. Figure is one is gone the other, in the other cab, is probably not   
   > in much better shape.   
      
   > Opened the fried driver. Coil is wound on a brown transparent plastic.   
   > Coil form was deformed. These drivers, 2414H-1, is supposed to be ferro   
   > fluid cooled. There was some faint traces of the fluid in this one. About   
   > enough to halfway circle the gap. That's consistent with the coil   
   > deforming. The fluid was cooling about half the coils diameter.   
      
   > Found a dealer online. Ordered two new drivers.   
      
   Can you replace only the burned out part, the diaphragm/voice coil assembly?   
   If so, you can save a lot of money, because complete drivers i.e.   
   diaphragm/voice coil/magnetic motor assembly is going for between $46 and   
   $58 bucks apiece.   
      
   > On to life's next problem.   
      
   > Oh, and for what it's worth, today's gig went well. Band plays Sunday.   
   > We'll use different speakers for that :-)   
      
   Maybe they're getting in the Vibe ;)   
      
   > There is a lesson in this. Over several of our last fwe gigs, people here   
   > and there have said our between song talking was muffled.  Was that this   
   > speaker ? We never heard any issue, because we hear a different set of   
   > cabs as the onstage monitors.  Lesson is, when people in the audience tell   
   > you something as a suggestion, don't just dismiss it out of hand. Maybe   
   > there is a problem   
      
   Jim   
      
   JBL does tend to push the proverbial 'envelope' and make those little horns   
   (1" dia voice coil) work awfully hard - I'd go with at least a 1 1/2" voice   
   coil. No wonder they burn out.   
      
   Ferrofluid is better used for protection against otherwise damaging heat in   
   the event of an overload, particularly in small voice coil (0.5" to 3/4")   
   drivers, such as tweeters, but not for continuous use...unless of course the   
   designer thinks that pushing the 'envelope' is okay - it's NOT!   
      
   Ouisie   
      
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