XPost: alt.audio.pro.live-sound, rec.audio.pro   
   From: trevor@home.net   
      
   "Peter Larsen"  wrote in message   
   news:4e3ad14c$0$56795$edfadb0f@dtext02.news.tele.dk...   
   > A bit of initial data: bass resistance some 2.5 Ohm, mid some 7 Ohm and   
   > piezo some 3.3 Ohm.   
      
   It's not a piezo, or there's something wrong with your measurement.   
      
      
   >Bulb resistance around 1 Ohm. After opening and   
   > assembling the deviant one its mid and treble went totally silent. Opened   
   > rear panel for bulb access. The main cause of problems was the bulb   
   > fixture.   
   >   
   > The bulb has small bullet on end that should match a contact surface that   
   > is   
   > loaded by spring. That surface was not perpendicular to the bulb axis and   
   > consequently the bulb had gone from lacking to no contact.   
   >   
   > Finagling with the contact surface and repeatedly rotating the bulb   
   > removed the majority of the difference between the two 4 Ohm boxes.   
   > Sound - nor curves - are not totally identical, but making physically   
   > identical measuring setups so exactly as required by an off-axis tweeter   
   > is non-simple. It probably will require soldering a bypass of the   
   > bulb-protection device to eliminate it as a cause of difference, at least   
   > during measurement and it is a long long way from being roadworthy in my   
   > understanding of that word.   
      
      
   I'd just replace the bulb with a soldered in polyswitch, or at least solder   
   the bulb instead of a socket.   
      
   Trevor.   
      
   --- SoupGate-Win32 v1.05   
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