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Old 18th April 2020, 03:57 PM   #1301
mabat is online now mabat  Czech Republic
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For a slightly higher DI -
It's actually better on diagonal (SPL_D chart). This is 14" wide, 1.4" throat. The cyan line is for 45 off axis (7.5 step).

Dmitrij_S - good points, I suppose.
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File Type: png wg1-mesh.PNG (249.3 KB, 279 views)
File Type: png wg1-h.png (17.9 KB, 411 views)
File Type: png wg1-d.png (18.0 KB, 409 views)
File Type: png wg1-pmap.png (32.1 KB, 408 views)
File Type: png wg1-imp.png (14.6 KB, 411 views)
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Last edited by mabat; 18th April 2020 at 04:01 PM.
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Old 18th April 2020, 04:33 PM   #1302
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Quote:
Originally Posted by gedlee View Post
A flatter waveguide is always going to be smoother, but with less DI control. As the DI gets raised there will be more problems. ...
It is actually about 90 coverage nominally (the first one).

Will try to test a bigger one with 1" throat.
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Last edited by mabat; 18th April 2020 at 04:37 PM.
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Old 18th April 2020, 05:15 PM   #1303
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Quote:
Originally Posted by mabat View Post
This is also funny: Today, solely by mistake, I tried something I didn't want (what could be considered as an error), but hey, the result is one of the best I have seen -
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Originally Posted by mabat View Post
Now I know how to improve things!
There you go
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Old 18th April 2020, 05:57 PM   #1304
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Quote:
Originally Posted by Dmitrij_S View Post
I suppose, revolutionary improvement would mean

* Flat acoustic loading from 200-300Hz and up to the last audio octave (e.g. like Heavise or step Sigmoid function).
* Constant directivity in the same frequency range. (I suppose beamwidth of -+(20-30) in all directions would be ok, at least for home audio).
*Horn-related acoustic nonlinearities would be comparable to that of the direct radiator.
*Perhaps, some kind of numerical criterion should specify a minimum value of HOMs amount.

"Revolutionary design" should improve all the point above at the same time. But as we know, "the horn reality" is completely different. Numerical optimisation helps to find a certain balance of contradictory horn parameters .

You mention 4, of which I came up with 3 myself.


Now some of Einstein's quotes would be appropriate, but redundant.

Last edited by Ro808; 18th April 2020 at 06:23 PM.
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Old 18th April 2020, 06:06 PM   #1305
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So, this is 16.1" x 15.5" horn, 1" throat. There are obviously some wiggles from the analysis as this was still only a coarse setting. Otherwise pretty good, isn't it.
Again, cyan line is for 45 off-axis.
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File Type: png wg2-mesh.PNG (338.3 KB, 74 views)
File Type: png wg2-h.png (17.2 KB, 102 views)
File Type: png wg2-d.png (17.4 KB, 93 views)
File Type: png wg2-pmap.png (32.6 KB, 84 views)
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Old 18th April 2020, 06:09 PM   #1306
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OK, this is the magic (or half of it). I guess it would be even patentable
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File Type: jpg wg-magic-3.JPG (29.3 KB, 136 views)
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Last edited by mabat; 18th April 2020 at 06:13 PM.
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Old 18th April 2020, 06:26 PM   #1307
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One more.
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Old 18th April 2020, 06:40 PM   #1308
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So the rectum appears to work
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Old 18th April 2020, 06:44 PM   #1309
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When done right
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Old 18th April 2020, 06:50 PM   #1310
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The same for a circular one (16.2") - there is a very slight narrowing just below and around 2 kHz compared to the rectangular one.
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File Type: png wgc-mesh.PNG (191.7 KB, 124 views)
File Type: png wgc-h.png (17.0 KB, 99 views)
File Type: png wgc-pmap.png (81.5 KB, 88 views)
File Type: png wgc-v.png (17.8 KB, 66 views)
File Type: png wgc-front.PNG (554.3 KB, 59 views)
File Type: jpg wgc.JPG (26.2 KB, 81 views)
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Last edited by mabat; 18th April 2020 at 07:09 PM.
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