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Multi-Way Conventional loudspeakers with crossovers

Klangfilm spherical wave horn calculator - from round to elliptical
Klangfilm spherical wave horn calculator - from round to elliptical
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Old 3rd November 2018, 07:44 AM   #21
docali is offline docali  Germany
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I have done some further modification options of the profile following the underlying concept.

Usually, such horns have the property that for the expanding profile all points along the horn axis of the outer shell are oriented in the same plane where at the mouth the horn is flat/flush to the speaker front/plane. I thought some time about this and found several options how the profile can be bended using the original Klangfilm construction vector r0.

The following three variants use different assumptions:

1. For every elliptical plane along the horn axis the origin of the construction vector is calculated. Then for every point of the ellipse the vector from this origin to this point is used, it's length is calculated and then normalized to r0. Then the ellipse point is slided alog this vector until the new vector has the normalized r0 length. So, the points near the major semi axis are shifted against the throat and points near the minor semi axis will be shifted in the opposite direction.

Klangfilm_elliptical_bended_1.jpg

2. The same construction vector is used but only the z-component is used to shift the points.

Klangfilm_elliptical_bended_2.jpg

3. The angle of the construction vector is changed while leaving it's length at r0 so that it ends at the elliptical cylinder. This only changes the z-component which is the horn axis. This option leeds to some dramatic looking profiles.

Klangfilm_elliptical_bended_3.jpg
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Old 19th November 2018, 07:11 PM   #22
docali is offline docali  Germany
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Finally, I have applied a stereographic projection to the profile using the construction vector r0. Like the world map is projected from the earth sphere to a plane this projection does the oppsosite.

I am quite happy with the results. Have used MeshLab to draw the surface area.

kfe_1.JPG

kfe_2.JPG

kfe_3.JPG
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Old 3rd March 2019, 09:39 AM   #23
docali is offline docali  Germany
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Hi!

only a small teaser what will be possible with the forthcoming version of my calculator. From round to elliptical, from round to squared or rectangled, projected or not projected, nearly everything is possible...

3D printing of the first horn is in the preparation phase.
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File Type: jpg drba_r1.JPG (32.1 KB, 260 views)
File Type: jpg drba_r2.JPG (37.4 KB, 262 views)
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Old 3rd March 2019, 09:46 AM   #24
Sabbelbacke is offline Sabbelbacke  Germany
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This looks great!
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Old 3rd March 2019, 02:47 PM   #25
docali is offline docali  Germany
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A 2:1 350 hz cur-off horn following the Klangfilm expansion equations...

drba_r3.JPG
drba_r4.JPG
drba_r5.JPG
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Old 3rd March 2019, 07:27 PM   #26
arcgotic is offline arcgotic  Romania
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Looks great! What dimensions will it be?
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Old 3rd March 2019, 08:54 PM   #27
docali is offline docali  Germany
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This particular horn has 305mm depth, 516mm width and 256mm hight and without stereographic projection. But nearly everything is possible...

And this is the same horn but with another Lamé exponent and the cohearent projection factor:

drba_r6.JPG

Last edited by docali; 3rd March 2019 at 09:08 PM.
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Old 8th March 2019, 04:48 PM   #28
docali is offline docali  Germany
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Here is an example of the rectangle horn but with cohearent projection factor:

drba_r7.JPG

drba_r8.JPG
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Old 8th March 2019, 06:58 PM   #29
docali is offline docali  Germany
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Now, with a small Lamé exponent:

drba_r9.JPG
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Old 8th March 2019, 07:11 PM   #30
Patrick Bateman is offline Patrick Bateman  United States
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Quote:
Originally Posted by norman bates View Post
I've seen the dip peak in symetrical horn, like the jbl sp212a, oasr horn but ripples in jbl's pdf.

Post 55
Flattest response between 2000hz - 20 000hz - Page 4

jbl sp212a - Google Search

I've been looking at the pt h1010hf waveguide that some like, there is even a newer one in plastic for under $70 (1.5" jbl). I notice jbl uses a 3khz notch with it. It is square 100 x 100 but looks fairly smooth walled for not being round.

JBL 442730-001 PTH1010HF-1 Waveguide - Speaker Exchange

Older pt 100x100

Something Old with Something New
Strangely enough, the round QSC waveguides are symmetrical but do not have that dip. I don't know how they did that:

Great Waveguide List
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