september.org> f8a6265a   
   From: zekor@comcast.net   
      
   Dick Pierce  wrote:   
   > gregz wrote:   
   >> I used a very short line and your probably right. Typical delay I measured   
   >> about 7 % . However, at 2.6 lbs per cubic foot, I got up to 35% , and was   
   >> hard to measure because it was a highly attenuated signal. at suggested   
   >> stuffing rates, 8 oz per cu ft., more like less than 3% delay. I don't   
   >> think its a transmission line if there is no signal at the end of the pipe.   
   >   
   > How are you measuring delay? By using the phase shift?   
      
      
   That's primarily how I did it, comparing wavefront near rear of driver with   
   microphone, then some distance away with identical microphone. I was using   
   a storage oscilloscope.   
      
   Greg   
      
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