Determine depth of waveguide/horn

AdamFelix · 29th August 2019, 12:56 PM

Is there a formula for determining the ideal depth of a waveguide or horn on the basis of mouth and throat dimensions?
I am considering building a horn/waveguide optimized for constant directivity not loading.

Drofdissonance · 29th August 2019, 01:49 PM

I think most would suggest a O.S. waveguide. then the waveguide dimensions and depth are set by the formula.

AdamFelix · 29th August 2019, 02:35 PM

Quote:

Originally Posted by Drofdissonance

I think most would suggest a O.S. waveguide. then the waveguide dimensions and depth are set by the formula.

Thanks!
What’s the formula?
A spreadsheet where I can type mouth and throat dimensions and then get the depth would be great.

AllenB · 29th August 2019, 03:11 PM

.

AdamFelix · 29th August 2019, 08:30 PM

Quote:

Originally Posted by AllenB

.

Hmmm..
I'm not sure how to use that sheet.
I have uploaded it to google sheets now. What does the different things mean in "real words"?

norman bates · 30th August 2019, 12:00 AM

tweet horn or bass horn ?

Patrick Bateman · 30th August 2019, 12:39 AM

Quote:

Originally Posted by AdamFelix

Is there a formula for determining the ideal depth of a waveguide or horn on the basis of mouth and throat dimensions?
I am considering building a horn/waveguide optimized for constant directivity not loading.

The beamwidth of a waveguide is the angle of the walls.

That's it.

When I first saw that, I thought it had to be more complex than that, but it isn't.

For instance, a conical waveguide measuring 90 x 90 degrees will have a beamwidth of 90 x 90 degrees.

AllenB · 30th August 2019, 03:51 AM

Throat radius, start angle, asymptote (end angle).

AllenB · 30th August 2019, 05:03 AM

Eg. 0.5, 0, 45
for a 1" driver,
0 for a dome (otherwise the compression driver exit angle)

Gaga · 30th August 2019, 07:31 AM

May be easiest would be to just use Hornresponse for calculation of your WG. Hornresp can do OS-WGs and will export dimensions in xls (or csv) format (do not remember exactly).

If you want to optimize for constant directivity, you either have to start over with simulations, or build and measure.... Both may be fun.

29th August 2019, 12:56 PM	#1
AdamFelix diyAudio Member Join Date: Sep 2007	Determine depth of waveguide/horn Is there a formula for determining the ideal depth of a waveguide or horn on the basis of mouth and throat dimensions? I am considering building a horn/waveguide optimized for constant directivity not loading.

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29th August 2019, 01:49 PM	#2
Drofdissonance diyAudio Member Join Date: Jun 2016	I think most would suggest a O.S. waveguide. then the waveguide dimensions and depth are set by the formula.

30th August 2019, 12:00 AM	#6
norman bates diyAudio Member Join Date: Nov 2003 Location: iowa	tweet horn or bass horn ?

30th August 2019, 03:51 AM	#8
AllenB diyAudio Moderator Join Date: Oct 2008	Throat radius, start angle, asymptote (end angle).

30th August 2019, 05:03 AM	#9
AllenB diyAudio Moderator Join Date: Oct 2008	Eg. 0.5, 0, 45 for a 1" driver, 0 for a dome (otherwise the compression driver exit angle)

30th August 2019, 07:31 AM	#10
Gaga diyAudio Member Join Date: May 2005 Location: City	May be easiest would be to just use Hornresponse for calculation of your WG. Hornresp can do OS-WGs and will export dimensions in xls (or csv) format (do not remember exactly). If you want to optimize for constant directivity, you either have to start over with simulations, or build and measure.... Both may be fun.