[gregz]

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