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Multi-Way Conventional loudspeakers with crossovers

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Old 14th January 2020, 06:15 PM   #761
mlee is offline mlee  Canada
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Quote:
Originally Posted by limacon View Post
Modelled well - testing tomorrow! Thanks mabat for an amazing tool! Target : HF146 & 12P80ND
Awesome!
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Old 14th January 2020, 07:40 PM   #762
limacon is offline limacon  United Kingdom
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Quote:
Originally Posted by mabat View Post
Would you mind showing the simulation results? Why two-part?
Sure. Not got around to physical testing yet.

Two parts? Just the thickness/stock issue. Baffle = 50mm. Throat addon positioned with the two 8mm pin holes you can see. Fits together perfectly and will probably glue in place later.

The addon = 73mm deep. Aiming for acoustic alignment of woofer and cd after a few design interations.

Well see. :-)

Ive put dowel pin holes on the back of the baffle so I can throw on some resin and recut throat shape if required.

Last edited by limacon; 14th January 2020 at 08:03 PM.
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Old 15th January 2020, 06:17 AM   #763
Ro808 is offline Ro808  Netherlands
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It looks like a 3-part horn to me: baffle part + 2-part addon, or does it only seem that way?

HF146 + 12P80ND, nice driver combo.

Last edited by Ro808; 15th January 2020 at 06:39 AM.
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Old 15th January 2020, 04:26 PM   #764
Ro808 is offline Ro808  Netherlands
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BTW, did you sand the throat?
From the photos it looks like if the OS contour has been smoothed.
Attached Images
File Type: jpg limacon's throat_original.jpg (229.8 KB, 210 views)
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Old 15th January 2020, 04:38 PM   #765
Ro808 is offline Ro808  Netherlands
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However, after some fiddling with illumination and contrast, the typical OS-contour becomes visible.
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File Type: jpg limacon's horn_illuminated.jpg (341.5 KB, 173 views)

Last edited by Ro808; 15th January 2020 at 04:40 PM.
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Old 15th January 2020, 05:12 PM   #766
limacon is offline limacon  United Kingdom
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Quote:
Originally Posted by Ro808 View Post
BTW, did you sand the throat?
From the photos it looks like if the OS contour has been smoothed.
No sanding. Just poor quality fluffy MDF. I used a 6mm ballnose over the surface.
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File Type: png pic3.png (355.1 KB, 165 views)

Last edited by limacon; 15th January 2020 at 05:35 PM.
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Old 15th January 2020, 06:16 PM   #767
Ro808 is offline Ro808  Netherlands
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With a smooth throat to rectangular transistion (without OS contour), one could obtain decent polars. Still, Marcel's ATH is obviously better.

These are 15 year old examples from a respected German horn manufacturer.
(BTW, he didn't use the textured material for cosmetic reasons )
Attached Images
File Type: jpg Limmer 021_150%.jpg (239.1 KB, 163 views)
File Type: png Limmer 021_Horizontal.png (290.0 KB, 152 views)
File Type: png Limmer 021_Vertical.png (293.3 KB, 31 views)
File Type: jpg Limmer 022_150%.jpg (378.3 KB, 46 views)
File Type: png Limmer 022_Horizontal.png (297.2 KB, 41 views)
File Type: png Limmer 022_Vertical.png (291.1 KB, 19 views)

Last edited by Ro808; 15th January 2020 at 06:21 PM.
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Old 15th January 2020, 06:35 PM   #768
Ro808 is offline Ro808  Netherlands
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Quote:
Originally Posted by limacon View Post
No sanding. Just poor quality fluffy MDF. I used a 6mm ballnose over the surface.
You did take the HF146's 29 exit angle into account, I presume?

Looking forward to your measurements.
It is not so often that someone uses an 1.4" exit driver with an OS waveguide.
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Old 15th January 2020, 07:14 PM   #769
limacon is offline limacon  United Kingdom
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Quote:
Originally Posted by Ro808 View Post
You did take the HF146's 29 exit angle into account, I presume?

Looking forward to your measurements.
It is not so often that someone uses an 1.4" exit driver with an OS waveguide.

Indeed, if you look at the above section you can see the HF146(grey) mating with the throat (green).

What are the main issues with 1.4 cd and OS?

I could machine in a texture at high speed. Also thought about covering the baffle/horn in a textured synthetic leather.

Last edited by limacon; 15th January 2020 at 07:33 PM.
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Old 15th January 2020, 07:49 PM   #770
Ro808 is offline Ro808  Netherlands
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Nothing in particular, but I believe an 1" entrance OSWG does the "pulling-out-of-the-wavefront-trick" somewhat better.
That is: up to 20k instead of ca. 15k, but this may depend on the phaseplug and the length of the driver's conical exit section as well

Perhaps Dr. Geddes could respond to this.
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