On a related topic, sealed speakers: In a past life, folks tried to find  
alternative uses for fluorinated gases. Testing was performed on replacing the  
air inside sealed speaker enclosures with gases such as C51-12  
(perfluorodimethylcyclobutane). The response curves when working against the  fluorocarbon 
gas were different from air. This is ca 30+ yrs ago, so I don't  recall the 
details. I'm sure other gases were tried as well, but it never went  commercial or 
was picked up for further development by speaker makers. 
All the lab reports/data are still in the archives, I'm sure, although the  
chemist has gone to the big lab in the sky.  

Bill  Kenyon
Global Centre Consulting
3336 Birmingham Drive
Fort Collins, CO  80526
Tel: 970.207.9586   Cell:  970.980.6373




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