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Multi-Way Conventional loudspeakers with crossovers

Midrange drivers in a circle?
Midrange drivers in a circle?
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Old 23rd February 2019, 02:58 AM   #1
Machismo is offline Machismo  Finland
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Default Midrange drivers in a circle?

I have never seen this kind of speaker that would have four or five midranges very close to each other and a tweeter in the center.

What would be the advantages and the disadvantages when compared to MTM for example?

Click the image to open in full size.
Click the image to open in full size.

It would be also possible to tilt the drivers pointing more inward or outward, how would that change the situation?
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Old 23rd February 2019, 03:26 AM   #2
Michael Bean is offline Michael Bean  United States
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I would be inclined to eliminate the version with five in a circle, it could have some odd lobing issues.
As for the other one, you could tip it up so the mids are in a horizontal/vertical arrangement and treat it like D'Appolito set up. It's an interesting idea.
As to tilting the drivers in or out, that would depend on the dispersion characteristics of the drivers, and the wavelengths they reproduce to determine what, if any effect it would have.

Mike
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Last edited by Michael Bean; 23rd February 2019 at 03:47 AM.
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Old 23rd February 2019, 03:41 AM   #3
njones is offline njones  United States
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This company does something similar but with a bunch of tweeters
Double Impact - Tekton Design | Improve your hearing
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Old 23rd February 2019, 04:31 AM   #4
googlyone is offline googlyone  Australia
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Midrange drivers in a circle?
Unless you crossed over to a tweeter at an unusually low frequency you would see significant beaming.

Without resorting to math, you can view this as one driver composed of the four (or five).

Assuming 4 to 6 inch drivers it would be broadly similar to driving an 8 or 12 inch driver at those frequencies.

A d'appolito gets away with things, indeed utilises this, by setting the drivers vertically. The horizontal radiation is as per the individual drivers, but the vertical is squashed in due to the larger vertical radiation size.
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Old 23rd February 2019, 05:06 AM   #5
Patrick Bateman is offline Patrick Bateman  United States
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Quote:
Originally Posted by Machismo View Post
I have never seen this kind of speaker that would have four or five midranges very close to each other and a tweeter in the center.

What would be the advantages and the disadvantages when compared to MTM for example?

Click the image to open in full size.
Click the image to open in full size.

It would be also possible to tilt the drivers pointing more inward or outward, how would that change the situation?
I think you'll dig this : Optimal MTM Geometry
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Old 23rd February 2019, 07:19 AM   #6
TNT is offline TNT  Sweden
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DNA Sequence Speakers dipole open baffle woofer high efficiency point source array midrange tweeter treble loudspeaker

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Old 23rd February 2019, 12:30 PM   #7
Machismo is offline Machismo  Finland
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So there was one speaker after all... Thanks for the link!

However, it does not seem that it was sold very much?

What do you think about the extra gaps, do you think they are only because of better looks or would making a tighter pack like this ruin something?

Click the image to open in full size.

Last edited by Machismo; 23rd February 2019 at 12:39 PM.
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Old 23rd February 2019, 01:46 PM   #8
adason is offline adason  United States
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Machismo, there are many speakers with such arrangement. You just did not search hard enough. Some even very successful commercially. Legacy audio...whisper.
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Old 23rd February 2019, 01:50 PM   #9
krivium is offline krivium  France
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Last edited by krivium; 23rd February 2019 at 01:54 PM.
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Old 23rd February 2019, 03:07 PM   #10
Machismo is offline Machismo  Finland
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Quote:
Originally Posted by adason View Post
Machismo, there are many speakers with such arrangement. You just did not search hard enough. Some even very successful commercially. Legacy audio...whisper.
Not so much the Whisper since the the arrangement is not circular:

Click the image to open in full size.

But the Legacy Audio Helix looks just what I was looking for. And it turned out that they have tilted the midranges just like I thought might be necessary. Also the pack is tight.

Click the image to open in full size.

Kharma Veyron EV-1 has also something like this, but more on the tweeter side.

Click the image to open in full size.
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