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Old Yesterday, 03:34 PM   #831
limacon is offline limacon  United Kingdom
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A few db bump at the desired spot that was flatter on the previous version.
Acoustic Horn Design The Easy Way (Ath4)

306 x 238 mm

What do you think? Worth a try?

Code:
  ThroatDiameter = 36                   ; [mm]
  ThroatAngle = 29                      ; [deg]
  Coverage_Horizontal = 88              ; [deg]
  Coverage_Vertical = 66                ; [deg]
  Depth = 100                           ; [mm]
  SE_s = 1.9
  SE_n = 3.0
  SE_q = 0.995  
  Depth.ConicSectionPart = 0.8         
  Shape = raw2rect  
  Shape.FixedPart = 0.2              
  Shape.CornerRadius = 35.0             ; [mm]
  SEExp = 2.5                           ; superellipse exponent
  ABEC.f1 = 500                              ; [Hz]
  ABEC.f2 = 18000                            ; [Hz]
  ABEC.NumFrequencies = 31
Attached Images
File Type: png hf146 v2.png (56.2 KB, 133 views)
File Type: png hf146 v2 polar.png (72.6 KB, 132 views)

Last edited by limacon; Yesterday at 03:39 PM.
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Old Yesterday, 03:49 PM   #832
mabat is offline mabat  Czech Republic
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Is this it? I don't know, the fact is that it is very smooth but it doesn't hold the pattern as good - it depends.

But I think you still don't have the measurement right. That would be my first concern.
Attached Images
File Type: png lima-0.PNG (136.0 KB, 132 views)
File Type: png lima-1.PNG (39.1 KB, 135 views)
File Type: png lima-2.PNG (53.1 KB, 134 views)
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Old Yesterday, 03:54 PM   #833
mabat is offline mabat  Czech Republic
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Quote:
Originally Posted by limacon View Post
306 x 238 mm
When I try your parameters, I get 288 x 218 mm.
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Old Yesterday, 04:21 PM   #834
limacon is offline limacon  United Kingdom
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Quote:
Originally Posted by mabat View Post
When I try your parameters, I get 288 x 218 mm.
Ahh, changed to 0.995 - you're right.
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Old Yesterday, 05:35 PM   #835
gedlee is offline gedlee  United States
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An unbaffled waveguide will show substantial differences from an enclose one (including infinite baffle.) I suspect that this is the issue between sims and reality. I have always said that open baffle is a really bad idea for a waveguide as the edge termination will cause diffraction even when there is a smoothed mouth termination.

These details are why we need to see more sim versus reality to find where the sim limitations come into play. At higher freqs there will be issues with the driver not supplying an ideal wavefront and at the lower freqs we will see differences due to baffling. This can be large or small, but need to be understood.

Clearly, I think, we can see that not baffling the waveguide is bad idea. More data and we might see some more issues that need resolution.
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Old Yesterday, 11:39 PM   #836
Patrick Bateman is offline Patrick Bateman  United States
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Quote:
Originally Posted by gedlee View Post
An unbaffled waveguide will show substantial differences from an enclose one (including infinite baffle.) I suspect that this is the issue between sims and reality. I have always said that open baffle is a really bad idea for a waveguide as the edge termination will cause diffraction even when there is a smoothed mouth termination.

These details are why we need to see more sim versus reality to find where the sim limitations come into play. At higher freqs there will be issues with the driver not supplying an ideal wavefront and at the lower freqs we will see differences due to baffling. This can be large or small, but need to be understood.

Clearly, I think, we can see that not baffling the waveguide is bad idea. More data and we might see some more issues that need resolution.
Here's some data if anyone's curious:

Click the image to open in full size.

21" x 8.4" ATH4 waveguide mounted on 28" x 28" baffle

Click the image to open in full size.

same waveguide, no baffle

Click the image to open in full size.

predicted response

Note: the first measurement goes from 0 to 55, the second goes from 0 to 44, and the last goes from 0 to 56
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Old Today, 07:24 AM   #837
mabat is offline mabat  Czech Republic
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It is very nice with the baffle on. Is it a diffraction from the baffle edge at 700 Hz?

(Just could you please post the pictures a bit smaller? It may be bothersome to read the page when they don't fit...)
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Last edited by mabat; Today at 07:27 AM.
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Old Today, 07:57 AM   #838
Ro808 is offline Ro808  Netherlands
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Quote:
Originally Posted by mabat View Post
Just out of curiosity - I expected it even worse.
(54 x 22 x 16 cm = W x H x D)
Makes me wonder what the sim of a 50 x 35 x 20 cm with 1.4" entrance would look like.

Last edited by Ro808; Today at 08:04 AM.
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Old Today, 08:06 AM   #839
mabat is offline mabat  Czech Republic
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You are free to try: Acoustic Horn Design – The Easy Way (Ath4)
(it was 1.4")
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