Which is a poorly executed clone of an ancient WE horn.
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Ro808 : I read that's an hyperbolic profile.
Didn't know it was a WE clone, thanks. I actually thought it was a marketing gimmick for old Japanese audiophiles nostalgic of the grammophone days !
Didn't know it was a WE clone, thanks. I actually thought it was a marketing gimmick for old Japanese audiophiles nostalgic of the grammophone days !
The Goto horn you posted earlier is the S-175, in Japan denoted by 'morning glory type straight horn'.
It's a rather big horn - comparable in size with the early Western-Electric petal PA horn - and meant for low-midrange reproduction (Cut-off frequency: 175Hz).
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In the early 1920s, WE also produced a smaller variant; the WE 3A. The Japanese seem to like such trumpets.
It's a rather big horn - comparable in size with the early Western-Electric petal PA horn - and meant for low-midrange reproduction (Cut-off frequency: 175Hz).
In the early 1920s, WE also produced a smaller variant; the WE 3A. The Japanese seem to like such trumpets.
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Yeah, no go. Tried for a 12 hours or so and then ends with error, not enough memory. So needs at least 128GB or even more. Clearly ABEC isn't meant for such a massive meshes.
There's another practical implementation (courtesy of misog) -
(The raw waveguide measured with 4 ms window. I believe the driver is 18Sound NSD1095N and the woofers are 10".)
(The raw waveguide measured with 4 ms window. I believe the driver is 18Sound NSD1095N and the woofers are 10".)
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Another photo of a build of Pet007's design called STH12 (12" woofers; these ones are by a guy from Slovakia).
Waveguides designed with Ath in both cases, of course 🙂
Waveguides designed with Ath in both cases, of course 🙂
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Radian drivers have negative throat angled (6 deg typically) - do you remember at which page Marcel shown sims with mirrored waveguide? For example 2" driver but 1" waveguide with mirrored throat.
I'd say don't do that, that's not how it works. Negative wall angle at the exit of a driver doesn't neccessarily mean that it produces a converging wavefronts. It depends on the phase plug and how far it reaches out. Also, it would resonate badly if done the way you suggest.
Ask them, I don't know 🙂 What you suggest would resonate, at least that is what I found with the simulations. It widens the beamwidth on HF but adds a bunch of other problems. The main point I tried to make is that it doesn't have to be the right match for the driver either.
The smurfed baffle wouldn't be my taste, but I like the veneer.
Is this what you mean? (exit of the 475 on the right, half angle = 6°):
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Sorry, this is all the information I have. I consulted the waveguide design to a degree but that's all I know.
If I understand this correctly, they have a driver with 1.6" at some diameter inside the driver and they can make it either 2" (950) or 1.4" (951) at the exit by using different conical sections from that point? If that's the case, I would rather not use the 951.
But then, I would not understand how "the 1.4" diameter exit of the 951 closely matches the area of the phase plug slits".
But then, I would not understand how "the 1.4" diameter exit of the 951 closely matches the area of the phase plug slits".
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Well, the angle 6.5 deg is not that large - maybe it's still just fine. You could easily try that with Ath+ABEC - simply use negative OS throat angle.
In this case it is really a minor difference. Would be interesting to see acoustic impedance though.
In this case it is really a minor difference. Would be interesting to see acoustic impedance though.
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