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Multi-Way Conventional loudspeakers with crossovers

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Old 22nd January 2020, 06:40 PM   #851
mabat is offline mabat  Czech Republic
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That's lovely! I only don't understand how to use it

Maybe this would be more intuitive: Superformula - JSXGraph Wiki (if it's correct - the "semi-axes" are acting strange)
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Last edited by mabat; 22nd January 2020 at 06:43 PM.
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Old 22nd January 2020, 06:56 PM   #852
mabat is offline mabat  Czech Republic
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OK, this is what you need: superformula

- Ah, it is less intuitive than I thought. Anyway, with this desmos chart, everyone should be able to set it up (after a while).
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Last edited by mabat; 22nd January 2020 at 07:06 PM.
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Old 22nd January 2020, 07:26 PM   #853
mabat is offline mabat  Czech Republic
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Another one tested, almost straight sides - such shape is still of reasonably constant directivity but obviously the sharp mouth edge make it less clean (diagonal polars included).
(Approx 36 x 24 cm)

We can do much, much better now.
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Old 22nd January 2020, 08:04 PM   #854
mabat is offline mabat  Czech Republic
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Yeah, it works.
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Old 22nd January 2020, 08:51 PM   #855
gedlee is offline gedlee  United States
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Quote:
Originally Posted by Patrick Bateman View Post
Click the image to open in full size.

So, the DNA array is an elegant solution: NONE of the drivers share the same X or Y axis, hence the smoother response.
But along alpha angle there will still be nulls.

The five drivers is a good idea.
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Old 22nd January 2020, 10:01 PM   #856
tmuikku is offline tmuikku  Finland
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Wow mabat, this is really something special for DIY audio community, the deed of the decade!

Last edited by tmuikku; 22nd January 2020 at 10:04 PM.
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Old 23rd January 2020, 12:17 AM   #857
Dave Zan is offline Dave Zan  Australia
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Quote:
Originally Posted by gedlee View Post
...there will still be nulls.
This points out a weakness in the "spinorama" (CTA 2034 standard) that it only measures on the horizontal and vertical axis so "dirt can be swept under the carpet" i.e just pushed into the unmeasured diagonals.
For instance it seems possible that the JBL M2 beaky horn may do this.
Are you still in contact with the people involved with speaker measurement standards?
Have you discussed this or considered it yourself?
Any idea of how I obtain a copy of the new standard update (CTA 2034B) to see if it's been addressed?

Best wishes
David
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Old 23rd January 2020, 04:02 AM   #858
mrk7 is offline mrk7  Australia
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Quote:
Originally Posted by mabat View Post
Superformula!

From now on it is possible to define a superformula (see wikipedia).

The download: www.at-horns.eu/release/ath-4.4.1.zip

Incredible!! Thanks!
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Old 23rd January 2020, 04:20 AM   #859
Ro808 is offline Ro808  Netherlands
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Originally Posted by Dave Zan View Post
This points out a weakness in the "spinorama" (CTA 2034 standard) that it only measures on the horizontal and vertical axis so "dirt can be swept under the carpet" i.e just pushed into the unmeasured diagonals.

Any idea of how I obtain a copy of the new standard update (CTA 2034B) to see if it's been addressed?

Best wishes
David
You can't, Project R3WG1 (ANSI/CTA-2034-B) is still a work in progress.

The current standard "2034-A" is attached, as well as some related documents.

Last edited by Ro808; 23rd January 2020 at 04:26 AM.
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Old 23rd January 2020, 04:50 AM   #860
Dave Zan is offline Dave Zan  Australia
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Originally Posted by Ro808 View Post
You can't...
It is still unfinished yes, my point was that unfinished standards are often open to public comments before they are finalised.
No use to finalise a standard and then discover that it has flaws.
And I expect the standards committee would send it to some "elder statesmen" of the field for comment, maybe Earl.

I already have CTA 2034A but the other attachments look of interest, thanks.
Maybe more comments after I read them carefully.*
Flaws in the standard are of more interest now that Marcel has provided us with tools to manipulate not just vertical and horizontal polars.

Best wishes
David

*Hmm... the third one (from Sausilito Audio Works) is inconsistent with the CTA 2034A standard, despite the fact it is referenced
I had read it before but never noticed the inconsistency.
The Klippel paper will take time to study, as usual with Klippel stuff.

Last edited by Dave Zan; 23rd January 2020 at 05:07 AM.
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