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Multi-Way Conventional loudspeakers with crossovers

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Old 17th June 2017, 07:03 AM   #1
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Default Synergy Eggstravaganza

This week I came up with a new speaker design that you might like to tinker around with. It's a combination of a bunch of things that I've studied over the past few years.

Here's why you might try it:

5) This speaker has controlled directivity over five octaves, which can improve imaging and inteligibility
4) This speaker is exceptionally small, which can be good for the WAF
3) This speaker is exceptionally cheap. A pair costs less than $100
2) This speaker is easy to build... If you have a 3D printer. There's no DSP, no fancy crossovers, all you need to do is build the enclosure
1) This speaker is partially horn loaded, which improves the overall output
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Old 17th June 2017, 07:59 AM   #2
S4m is online now S4m  Germany
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Now I'm curious what you got
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Old 17th June 2017, 10:30 AM   #3
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Click the image to open in full size.

A few months ago I put a Tymphany TC9 in a 3D printed egg, and found that it worked well. The frequency response was good, the distortion was low. The thing that was particularly interesting is that the polar response behave like a waveguide. My 'hunch' is that the waves bending around the enclosure reduce output to the sides of the enclousre. So it's not a "true" waveguide, but the polars are similar to one.

Click the image to open in full size.

Click the image to open in full size.
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Old 17th June 2017, 11:28 AM   #4
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better than these Click the image to open in full size.

Click the image to open in full size.
this was first thing on my mind
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Old 17th June 2017, 11:44 AM   #5
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Large well pronounced baffle step issue is occuring between 2-3kHz which results with sudden 10dB power response loss inside rear hemisphere. Coloration of voice inside of bright acoustically room is likely to happen. This is critical range where humans ears are particularly sensitive. These indeed would sound harsh and thin like cheap PC boxes.. Please make outer dimensions of the eggs bigger or try more pronounced difference in dimensions between two elipsoid axis to drop baffle step below 1k... This enclosure is good for tweeter where baffle step occures outside of passband and not for FR driver.

Last edited by Windforce85; 17th June 2017 at 11:48 AM.
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Old 17th June 2017, 01:25 PM   #6
Bigun is offline Bigun  Canada
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If you want this to be more popular you could try finding some consumer item of a suitable shape that is more easily available and can be adapted to form the enclosure.
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Old 17th June 2017, 01:29 PM   #7
Mayuri is offline Mayuri  Finland
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Very interesting. Have you tried how a similar spherical enclosure acts?

Quote:
Originally Posted by Bigun View Post
If you want this to be more popular you could try finding some consumer item of a suitable shape that is more easily available and can be adapted to form the enclosure.
IKEA blanda bowls?
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Old 17th June 2017, 06:38 PM   #8
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So here was my plan:

I wanted to take what was good about that egg shaped enclosure, and try to improve on it by putting a coax in there. But I also wanted to try something that David Smith alluded to here:

Detriments of a coaxial woofer?

"I did some measurements on the IM issue when KEF came out with UniQ. The issue is response variation with shifting woofer cone position. You measure the tweeter response and then DC shift the woofer in and out. With the KEF units the response was pretty consistent, so no IM.

At PSB I made some coax units with a waveguide on the tweeter mounted on a pivot in front of the woofer cone. Response was way better than any post mounted tweeter. Although the waveguide was fairly large it had almost no effect on woofer response.

The BBC did some interesting designs with tweeters mounted on a perforated plate in front of the woofer. JBL sells some pro ceiling speakers with the tweeter on a slotted waveguide.

Lots of fertile ground here.

David S"


So here's how this works:

We still have an egg shaped enclosure, but now there's a coax instead of a full range in there. And there's a phase plug on the woofer and a waveguide on the tweeter. The idea is that the waveguide will control the tweeters beamwidth, but the phase plug may 'clean up' the tweeters response.' The idea is to eliminate those early reflections off of the woofer cone.

Click the image to open in full size.

Here is a picture of the enclosure. It's basically an egg, with a coaxial, and a phase plug.

Click the image to open in full size.
This cutaway illustrates how it works. The tweeter radiates via that waveguide. The woofer radiates via those rings. So it's similar to a Synergy Horn, but instead of a pyramid it's an egg.
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Old 17th June 2017, 06:39 PM   #9
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Quote:
Originally Posted by Bigun View Post
If you want this to be more popular you could try finding some consumer item of a suitable shape that is more easily available and can be adapted to form the enclosure.
But it's so much more fun to make things in 3D!
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Old 17th June 2017, 06:50 PM   #10
Pallas is offline Pallas  Pakistan
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Quote:
Originally Posted by Patrick Bateman View Post
So here's how this works:

We still have an egg shaped enclosure, but now there's a coax instead of a full range in there. And there's a phase plug on the woofer and a waveguide on the tweeter. The idea is that the waveguide will control the tweeters beamwidth, but the phase plug may 'clean up' the tweeters response.' The idea is to eliminate those early reflections off of the woofer cone.

Click the image to open in full size.

Here is a picture of the enclosure. It's basically an egg, with a coaxial, and a phase plug.

Click the image to open in full size.
This cutaway illustrates how it works. The tweeter radiates via that waveguide. The woofer radiates via those rings. So it's similar to a Synergy Horn, but instead of a pyramid it's an egg.
Are you using a concentric and fitting a WG around the tweeter, a la Danley SM60?
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