35cfa6ce   
   From: dpierce@cartchunk.org   
      
   David (World) Reitter wrote:   
   >   
   > I measured resistance and couldn't get any current to go through it.   
      
   Usually a reasonable indicator of a dead tweeter.   
      
   > However, this morning the tweeter in question magically started   
   > working.  I had given it a fair amount of abuse with a vacuum cleaner   
   > last night (the middle bit of the membrane was pushed in when I bought   
   > it - Wikipedia tells me this is a dust cap?).  I don't what made it   
   > work suddenly.  Resistance of that driver is now showing at a little   
   > over 4 ohm.   
      
   Likely what has happened is some little kid poked his finger   
   in and collapsed the diaphragm. But, beyond that, it also   
   sounds like an intermittant electrical failure. The two are   
   not unrelated: one of the most vulnerable parts of many   
   tweeters is the short lead-out wire: this gets the most   
   mechanical abuse, undegoing continuous bending and can weaken   
   the wire. I've seen innumerable cases where it held on by   
   the skin of its teeth (actually, the plastic of its insulating),   
   and would work intermittantly. A stray younger finger would send   
   it into permanent failure.   
      
   Even if you got it working, it's likely you'll need new   
   tweeters: if my guess is correct, it WILL fail again, and   
   poking in the tweeter done is likely to have done other damage   
   as well.   
      
   > I'm probably trying to get new tweeters anyways, as these speakers   
   > still sound very dull unless I boost high frequencies at the source,   
   > and the high freqs seem louder on one speaker than on the other.   
   > Would such degradation be typical?   
      
   It's not "degredation," it's out-and-out failure.   
      
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