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Asymmetrical Synergy Horn
Asymmetrical Synergy Horn
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Old 1st March 2017, 12:04 AM   #1
Patrick Bateman is offline Patrick Bateman  United States
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Default Asymmetrical Synergy Horn

About a week ago, I made a 'JBL M2' style horn. (M2 Synergy Horn) It didn't work well; I was hoping that the 'knuckles' on the M2 type of waveguide would allow me to 'hide' the Synergy Horn midranges. But the polars and the frequency response were not good.

It occurred to me that another way to 'hide' the woofers is to make the horn asymmetrical.

(If anyone's curious why I'm trying to 'hide' the midranges, I'm trying to make a Synergy horn which can be absolutely pushed into a corner. So 'tucking' the midranges into the waveguide makes this possible.)

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Last week's waveguide on the left, this week's on the right

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I crammed as many drivers on here as I could possibly fit. Dual Dayton ND91s for the lows, and three Aurasound Whispers for the highs. The compression driver is a BMS 4552.

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I put a lot of time and effort into having a smooth transition from the throat to the rest of the waveguide. Compare this to the 'M2' waveguide, this one is way smoother

Click the image to open in full size.
Click the image to open in full size.
Here's the waveguide placed into a mirrored corner, to give you an idea of what I'm trying to do. I want the speaker to fit in that corner as tightly as possible. Basically minimize the transition from the waveguide to the corner.
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Old 1st March 2017, 04:33 AM   #2
pcgab is offline pcgab  United States
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Asymmetrical Synergy Horn
Synergy horns in the master bath, or car? Haha

Have you had a chance to measure the new born?

Do you need that many mid drivers?

Do I see phase plugs in the mid ports?

I'm full of useless questions. Also, the green is awesome.
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Old 1st March 2017, 04:50 AM   #3
Patrick Bateman is offline Patrick Bateman  United States
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Quote:
Originally Posted by pcgab View Post
Synergy horns in the master bath, or car? Haha

Have you had a chance to measure the new born?

Do you need that many mid drivers?

Do I see phase plugs in the mid ports?

I'm full of useless questions. Also, the green is awesome.
Yep, this is for my car. Posted it here because it could be useful for a corner horn in a home

I'll post measurements shortly

Those AuraSound drivers have REALLY low efficiency so you have to use a pile of them to keep up

Yes, the midranges have phase plugs. When you're 3D printing there's no cost to add a phase plug, so why not? It doesn't seem to make a whole lotta difference, but it doesn't hurt either
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Old 1st March 2017, 05:06 AM   #4
pcgab is offline pcgab  United States
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Asymmetrical Synergy Horn
Definitely one of the positive side effects of printing tech becoming so much easier and cheaper to use.
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Old 1st March 2017, 05:16 PM   #5
nc535 is offline nc535
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Here is one that fits tightly into a corner but I doubt a pair will fit into your car, perhaps an SUV (click the picture to unsquash it)

Asymmetrical Synergy Horn-fig-5-jpg

Interesting to consider 3D printing the driver subassembly and bolting it onto rectangular wooden conical extension for use in the home.
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Old 1st March 2017, 07:07 PM   #6
Patrick Bateman is offline Patrick Bateman  United States
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^^ I'd love to hear that!
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Old 1st March 2017, 07:21 PM   #7
Patrick Bateman is offline Patrick Bateman  United States
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Click the image to open in full size.
Here's the frequency response and distortion of the BMS 4552 on the asymmetrical waveguide. I'm pretty happy with these results. This is with no EQ. It is not as ruler-flat as the best waveguides, but it is in the ballpark.

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For comparison's sake, here's the best measuring waveguide that I've ever measured. This is QSC's big 15" waveguide, the one that is really really close to an oblate spheroidal waveguide. This measurement is using the compression driver that the waveguide is intended for, a neodymium CD from Celestion.

My new waveguide isn't QUITE this good, but it's in the ballpark, and that's pretty great considering there's over a dozen holes in the waveguide.

Click the image to open in full size.
For comparison's sake, here's the frequency response and distortion of the JBL 'M2' style waveguide that I made last week. It's definitely not in the same league as my new waveguide.

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Here's the polar response of the new waveguide. Very good IMHO
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Old 3rd March 2017, 03:07 AM   #8
bwaslo is offline bwaslo  United States
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Asymmetrical Synergy Horn
Pretty neat there, PB! That's a rather nice curve for that waveguide (considering all the holes). Any measurements with midranges included?

You've started me scouring through the 3D printer forums and ads, now. My wife hates it.
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Old 3rd March 2017, 04:58 AM   #9
pcgab is offline pcgab  United States
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Asymmetrical Synergy Horn
The un-eq'd response and polars surprised me. Interested to see measurements with all the drivers and eq'd a bit.

You must have a hell of a commute to put this much time into car audio haha


I think ill be buying a printer in the next week or so. I've been waiting long enough.
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Old 7th March 2017, 04:42 AM   #10
Patrick Bateman is offline Patrick Bateman  United States
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Quote:
Originally Posted by pcgab View Post
The un-eq'd response and polars surprised me. Interested to see measurements with all the drivers and eq'd a bit.

You must have a hell of a commute to put this much time into car audio haha


I think ill be buying a printer in the next week or so. I've been waiting long enough.
I work at home lol
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