september.org> a24ed0be   
   september.org> f8a6265a   
   From: zekor@comcast.net   
      
   gregz  wrote:   
   > 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   
      
   Just thinking, I was using higher density stuffing amounts that would   
   ordinarily be used, but my short line was just that, short. A full line   
   would show more delay but using a lot less stuffing, so the delay would   
   probably be no more than 15%, perhaps closer to 10% .   
      
   Greg   
      
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