Hello Earl
"More the measurements in this thread. They all have different drivers and the drivers have resonances. So it very hard to tell what resonances are from the driver and what are from the horn. Resonances are resonances."
OK fair enough but only the PTH1010 has a different driver. The rest are using a 2426 1" driver. When I was taking them it was not to compare CSD measurements or from all one set-up. Based on that alone there is some variation in them.
"Others can bastardize the term "waveguides", but that doesn't mean that I have to. If it has intentional diffraction as a directivity controlling means then, to me, it is a difraction horn. Smooth it, round it, do whatever you want, it still relies on diffraction for its control, and that, to me, is a no-no."
Fair enough.
"Could you somehow get me those impulses and the names, photos preferably. E-mail or post either way. I'd like to look at them all at one time."
Sure I will set them up in CLIO and post them as JPGs. If you want I can email you text files.
"I might have to do a study sometime of the spectragram to see if the HOM can be seen in it. "
That would be great if we could see them. I was wondering if they could be seen in a CSD plot.
Rob
"More the measurements in this thread. They all have different drivers and the drivers have resonances. So it very hard to tell what resonances are from the driver and what are from the horn. Resonances are resonances."
OK fair enough but only the PTH1010 has a different driver. The rest are using a 2426 1" driver. When I was taking them it was not to compare CSD measurements or from all one set-up. Based on that alone there is some variation in them.
"Others can bastardize the term "waveguides", but that doesn't mean that I have to. If it has intentional diffraction as a directivity controlling means then, to me, it is a difraction horn. Smooth it, round it, do whatever you want, it still relies on diffraction for its control, and that, to me, is a no-no."
Fair enough.
"Could you somehow get me those impulses and the names, photos preferably. E-mail or post either way. I'd like to look at them all at one time."
Sure I will set them up in CLIO and post them as JPGs. If you want I can email you text files.
"I might have to do a study sometime of the spectragram to see if the HOM can be seen in it. "
That would be great if we could see them. I was wondering if they could be seen in a CSD plot.
Rob
soongsc said:
I think that foam plug in a CD works very different from placing foam in front of a dome tweeter or ribbon
Maybe it changes the horn flare device into a device that mainly controls directivity ... I am sure he will argue with that
As Earl said, the throath transistion and rounded mouth are the main factors
I would like to see a horn flare that doesnt need that foam plug ... maybe much bigger mouth roundings will do the trick ... outer edges may have to be rounded too ... its seen before
ZilchLab said:
Yes, Waveguide theory is different form Horn theory (read my paper). Either its a waveguide or its not. And waveguides MEAN seperable corrdinate geometry that minimizes diffraction. Otherwise you are bastardizing the original meaning of the term. I coined it, I get to say what it means.
You are trying to confuse the issue.
Attached are the same except in the vertical plane. This is crap, as expected. If you're spraying sound at people directly in front of you outside it probably works well, but I wouldn't want this in a home stereo... I don't care how nice you can get things on axis.
Attachments
Hello,
Earl, due to "friday evening fever" and as I was in a hurry to leave my office, i inverted my "rule of 3".
The sampling frequency of signal "waveguide00" is not (3/2) 48k but (2/3) 48k so it is 32k.
We can verify using the CSD graphs.
On the CSD graph of signal "waveguide00" for t=0 the curve is abruptely cut for the maximum frequency diplayed. Now if we look for the same level on the CSD (t = 0) for the signal "waveguide" we find 16k, this means that the sampling frequency of signal "waveguide00" is 2 times this (Nyquist frequency) so Fs = 32k.
About taking 2 reference points on the 2 signals, this is done with the pulses normalized, merged and correctly trimmed (see attached screen copy).
Best regards from Paris, France
Jean-Michel Le Cléac'h
The level
Earl, due to "friday evening fever" and as I was in a hurry to leave my office, i inverted my "rule of 3".
The sampling frequency of signal "waveguide00" is not (3/2) 48k but (2/3) 48k so it is 32k.
We can verify using the CSD graphs.
On the CSD graph of signal "waveguide00" for t=0 the curve is abruptely cut for the maximum frequency diplayed. Now if we look for the same level on the CSD (t = 0) for the signal "waveguide" we find 16k, this means that the sampling frequency of signal "waveguide00" is 2 times this (Nyquist frequency) so Fs = 32k.
About taking 2 reference points on the 2 signals, this is done with the pulses normalized, merged and correctly trimmed (see attached screen copy).
Best regards from Paris, France
Jean-Michel Le Cléac'h
The level
gedlee said:
Attachments
gedlee said:
What it means to you, surely, but not as a term of art in general usage.
In Bauman, Adamson & Geddes (1992), you acknowledged:
Well, fine, and in respect for you and your important work in this area, I suspect everyone's willing to go along with that here, but also with the understanding that in the industry and the literature at large, the term is not so narrowly construed....
gedlee said:
No, merely illustrating that with technological advances such as Progressive Transition, it becomes increasingly difficult to sustain the distinction as meaningful in either implementation or performance:
"Looks like OS in the vertical...."
"Head and shoulders better than most diffraction horns...."
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