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Multi-Way Conventional loudspeakers with crossovers

SEOS 30 synergy
SEOS 30 synergy
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Old 13th September 2017, 12:16 PM   #1
AdamFelix is offline AdamFelix  Denmark
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Default SEOS 30 synergy

Hi all,
I'm considering building a synergy horn, but the square horn/waveguide shape seems to be a compromise, when arrayability is not a concern. Would the SEOS 30 be a good choice for a synergy horn?
Any thoughts and experiences are very much welcome!
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Old 13th September 2017, 03:55 PM   #2
nc535 is offline nc535
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SEOS15 has shown to be a good choice and one would think bigger would be better. This very large SEOS extends pattern control lower and requires a 2" exit CD, which supports a lower crossover frequency. Aside from the cost, I don't see any negatives but there are some unknowns. Auto-tech does not publish the polars and only the one photograph from which its hard to judge potential issues in attaching woofers. I wouldn't use a version with an extended neck tapered down to a 1.4" or 1.5" CD; that seems a potential cause of diffraction and might push the woofer entry holes too far forward.

Why would rectangular be a compromise? Rectangular gives you lower horizontal pattern control than vertical but also a listening window that is wider than it is tall, which seems appropriate. On the other hand, a rectangular horn with a 30" x 30" mouth would do a better job of limiting floor and ceiling reflections but where can you get a ready made horn of those dimensions?
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Old 13th September 2017, 05:35 PM   #3
LineSource is offline LineSource  United States
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There are a couple diy theads on building a Synergy horn using the SEOS-24 with positive meaurements and listener feedback. You should expect some SPL loss at high frequencies because the SEOS-24-30 uses a 1.4" compression driver instead of 0.75" or 1" used in perfectionist multi-horn speakers. No reason the larger SEOS-30 would have poorer performance, but the devil is in the details of port shapes and complex crossovers.

The Klipsch K-402 plastic horn has been used in a few diy Synergy builds / threads. The sides on the K-402 have enough flat area to mount Synergy drivers. A K-402-Based Full-Range Multiple-Entry Horn - Technical/Modifications - The Klipsch Audio Community

If you have a large budget, a BMS coaxial compression driver like the 1.4" diameter BMS 4954nd can cover down to 450Hz and simplify a home synergy construction.

The cut-off frequency for a horn is set by the mouth area. The mouth area should exceed (Cutoff_wavelength^2) / 4Pi

SEOS-30 = 780mm x 527mm = 41106sqmm = 90Hz lowest cut-off frequency. Baffle step and adequate horn loading from the small/narrow woofer ports cut into the SEOS-30 will push this up closer to 180Hz.
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Old 13th September 2017, 06:46 PM   #4
4real is offline 4real  Netherlands
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Interesting idea this. Judging by the drawings it should be possible to put some drivers on there. I'm myself contemplating a synergy build for the winter (it's coming..), and was planing to use one of the BMS coaxes. I'm currently thinking of BMS 4590. It's one of the cheapest options, and it looks like it has the smoothest response (according to the data sheet).

Any idea of the cost of the horn?
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Old 13th September 2017, 06:59 PM   #5
nc535 is offline nc535
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this is what was quoted to me back in May for delivery to US

Pair of glossy white SEOS30 will costs 470 Eur
Painting for any colour 200 Eur/pair
Deilievery with custom clearance c.a. 500 Eur.
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Old 14th September 2017, 01:41 AM   #6
Pallas is offline Pallas  Pakistan
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That sounds cheap to me, compared to the time/materials/molds/etc. investment of making them oneself.
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Old 14th September 2017, 02:38 AM   #7
bwaslo is offline bwaslo  United States
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SEOS 30 synergy
The catch with that is you will most likely find you need to adjust the port locations, port wall thickness, and sizes from what you calculate. With $500/ea fiberglass horns, I'd be nervous about planning on getting it "right" on the first shot. Of the synergy/unity type horns I've made, I've needed to tweak midrange porting for each type at least once. That's the advantage of cheaper plastic horns or of 3D printing the horns, there isn't the need to avoid iterations.

Probably you could use fiberglass patch to refill and move ports if/when needed, but cosmetically that won't be so nice. Or you could get them close enough to work some (avoid deep nulls in-band) and then use external EQ to force it all to work.
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Old 14th September 2017, 06:24 AM   #8
4real is offline 4real  Netherlands
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... or order a third one ...

Or one could build cheap replica to test the location of the holes. How accurate does a replica need to be to make it comparable enough?
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Old 14th September 2017, 11:41 AM   #9
hasselbaink is offline hasselbaink  Denmark
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The Klipsch K-402 horn for a synergy like application would be wizard! Good luck trying to get hold of one of these...

If anyone knows where to buy the damn thing (even a knock off) please let me know.

Kris
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Old 14th September 2017, 12:13 PM   #10
billshurv is offline billshurv  United Kingdom
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SEOS 30 synergy
You could ask red spade if this Red Spade Audio: PSE-144 launch update is still available.
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