-september.org> e01c6745   
   From: zekor@comcast.net   
      
   Dick Pierce  wrote:   
   > gregz wrote:   
   >> You will also find a delay of the 30 Hz since it's below resonance, the   
   >> spider will slow it down and cause a phase shift.   
   >   
   > Uh, no. The spider does not "slow it down and cause a   
   > phase shift." Whatever phase shift exists is not because   
   > the "spider slows it down."   
   >   
      
   I guessed. When I was trying to figure out transmission line speakers, I   
   experimented with a 6.5 inch driver and a pipe. I was trying to figure out   
   delays along the pipe with stuffing. I first used the generator as sync and   
   measured various lengths along pipe. What was predicted was lower   
   frequencies having longer delays through stuffing. Until I placed a second   
   mic right behind the driver did I discover the delay was caused by the   
   driver. This was below resonate frequency of driver. I never found the   
   predicted longer delay at lower frequencies according to at least one   
   paper.   
      
   Greg   
      
   >> Thats all I'm going to rehash about the 901,   
   > That's good to know.   
   >   
   >> plenty of old stuff in the archives.   
   >   
   > And just like the Internet in general, some of it right,   
   > some of it wrong, and much of it irrelevant.   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)