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Old 13th February 2020, 03:51 AM   #1001
norman bates is offline norman bates  United States
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post 993.

the graph on the right (when 2 graphs shown), that is the non knuckles ?

Response looks really good to me (compared to so so much) on the non knuckles.

what are the graphs, left to right again ? vertical, horizontal, diagonal ?

Last edited by norman bates; 13th February 2020 at 03:55 AM.
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Old 13th February 2020, 08:22 AM   #1002
mabat is offline mabat  Czech Republic
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Quote:
Originally Posted by cowanaudio View Post
Try measuring a bare compression driver, they show significant pattern control above 10KHz. How can a waveguide without a diffraction slot make this wider? I'm assuming your "waveguide done properly" does not have a diffraction slot.
Oh no, we are back at this again

OK, I just quickly simulated the following two cases:
a) 175deg OS waveguide, i.e. almost a flat baffle, which is really the limiting case for an OS waveguide as coverage angle approaches 180deg;
b) 90deg OS wavaguide.

The pictures will follow...
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Old 13th February 2020, 08:23 AM   #1003
mabat is offline mabat  Czech Republic
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A "flat baffle" case (175deg coverage):
Attached Images
File Type: png oswg-175-spl.png (14.9 KB, 393 views)
File Type: png oswg-175-pmap.png (50.0 KB, 407 views)
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Old 13th February 2020, 08:24 AM   #1004
mabat is offline mabat  Czech Republic
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90deg waveguide:

(Both cases for 1" throat.)
Attached Images
File Type: png oswg-90-spl.png (13.3 KB, 421 views)
File Type: png oswg-90-pmap.png (35.1 KB, 421 views)
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Old 13th February 2020, 08:26 AM   #1005
mabat is offline mabat  Czech Republic
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Since the flat baffle is the limiting case for an OS waveguide as the coverage widens (up to 180deg), there must be a continuum.
Any comments or suggestions?

- Does anyone know how to thicken the plot lines in VACS?
Attached Images
File Type: png wg175.png (85.8 KB, 417 views)
File Type: png wg90.png (91.8 KB, 70 views)
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Last edited by mabat; 13th February 2020 at 08:41 AM.
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Old 13th February 2020, 09:02 AM   #1006
mabat is offline mabat  Czech Republic
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Quote:
Originally Posted by fluid View Post
Seems the over 10K response is smoother without the big dip in the M2 clone, could you extend the sim to go to 20K to see it better?
I can but it makes a huge difference in BEM running times. I try to limit the mesh resolution as possible to speed things up. There's still a lot to look at and improve between 1k - 10k. IMO, there's too many unknowns above 10 kHz that it makes little sense to try to simulate it this way. I can try occasionally. This might be an interesting case.
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Old 13th February 2020, 09:10 AM   #1007
mabat is offline mabat  Czech Republic
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120deg OS waveguide -
Attached Images
File Type: png wg120.png (14.6 KB, 90 views)
File Type: png wg120-pmap.png (48.1 KB, 80 views)
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Old 13th February 2020, 09:21 AM   #1008
mabat is offline mabat  Czech Republic
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Quote:
Originally Posted by norman bates View Post
post 993.

the graph on the right (when 2 graphs shown), that is the non knuckles ?
Yes.

Quote:
what are the graphs, left to right again ? vertical, horizontal, diagonal ?
Yes. The graphs are labeled "SPL_H / SPL_V / SPL_D" accordingly.
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Old 13th February 2020, 09:57 AM   #1009
mabat is offline mabat  Czech Republic
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...some may be waiting for 60 degrees (Mind the scale shift.)
Attached Images
File Type: png wg60-spl.png (13.8 KB, 91 views)
File Type: png wg60-pmap.png (36.1 KB, 96 views)
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Old 13th February 2020, 10:47 AM   #1010
mabat is offline mabat  Czech Republic
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60, 35 mm driver exit. Up to about 15k it's virtually without a change compared to 1".
Attached Images
File Type: png wg60-35-spl.png (13.7 KB, 91 views)
File Type: png wg60-35-pmap.png (33.9 KB, 75 views)
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Last edited by mabat; 13th February 2020 at 10:55 AM.
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