It's not so easy as changing the throat angle changes the whole profile. I thought about that several times but always gave up.
Can somebody post the ABEC results of a good horn they have simulated?
I'm trying to design a 3cm throat / 30cm mouth one and looking for inspiration
This is what I would recommend: #1402
It has elliptical guiding curve and circular mouth. The result is remarkably smooth, still of reasonably CD and almost without a hint of narrowing.
If you prefered rotational symmetry because of the ease of manufacturing, this would by my bet: bmc0's waveguide (should be possible to come very close to that shape with Ath)
And of course, there is a variety of promising squarish/rectangular shapes, some of them showed here, several pages back.
If I were ever to use a large format 2-inch driver as a wide-range source, it would probably be with something like this (27" x 14") -
(There are some numerical defects above 3 kHz, probably still due to mesh coarseness, otherwise it should be pretty smooth.)
(There are some numerical defects above 3 kHz, probably still due to mesh coarseness, otherwise it should be pretty smooth.)
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BTW, this is what I get for a waveguide probably not far from what bmc0 has shown in the other thread (0 - 90 / 10 in an infinite baffle; normalized at 15°). It is stricly axisymmetric so that makes it harder to get rid of the ripple but I think what he achieved is already pretty good for the size.
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This one is axisymmetric?
Perhaps someone with the DCX at hand (Mark100?
) is willing to make a crude prototype according to bmc0's method. A wooden template fixed to a rod may suffice.
The horns in posts # 2073 and # 2076 are particularly interesting because of their depth.
I wonder what the response in the upper octave looks like, since the throat is no longer visible about 30° off-axis.
Given the depth, I am afraid the waveguides will also sound (more) like a typical horn, ie "cuppy".
It is consistent with Holland & Newell's findings: horns with an axial depth > 30 cm are likely identified as horns in a controlled blind listening test, with the exception of multicellular horns.
I wonder what the response in the upper octave looks like, since the throat is no longer visible about 30° off-axis.
Given the depth, I am afraid the waveguides will also sound (more) like a typical horn, ie "cuppy".
It is consistent with Holland & Newell's findings: horns with an axial depth > 30 cm are likely identified as horns in a controlled blind listening test, with the exception of multicellular horns.
