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omnnidirectional synergy horn?
omnnidirectional synergy horn?
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Old 29th December 2014, 07:23 PM   #1
Slothrop is offline Slothrop  United States
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Default omnnidirectional synergy horn?

Could something like this work?
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File Type: jpg odh03.JPG (410.2 KB, 755 views)
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Old 29th December 2014, 10:58 PM   #2
OllBoll is offline OllBoll  Sweden
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Originally Posted by Slothrop View Post
Could something like this work?
Probably, but keep in mind that the actual horn is short so there will be no horn loading at lower frequencies. The dispersion will probably not be as uniform as a normal synergy horn.

A possible solution would be to open the top and bottom but damp the back wave of the midranges so you get dual opposed & slightly angled cardioids, if that would work then the response should be more uniform. I give no guarantees though, just a crazy idea that popped up in my head
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Old 30th December 2014, 03:46 AM   #3
CLS is offline CLS  Taiwan
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If we go omni, then we'd hear a larger portion of reflected sound in room.

I doubt it's worth the effort making it a Synergy, in which the major advantage is a point source with directivity control.
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Old 30th December 2014, 12:03 PM   #4
xrk971 is offline xrk971  United States
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omnnidirectional synergy horn?
I agree that the directivity and point source is what makes the synergy special. It removes the background wall reflections that open face driver speakers have and makes everything sound cleaner.
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Old 31st December 2014, 12:24 PM   #5
Slothrop is offline Slothrop  United States
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Thank you all for your comments. The thing is, I've come to regard some room reflections as A Good Thing. Reading Floyd Toole's book gave me a new perspective on what a loudspeaker ought to try to do, especially as regards directivity. I recently built a pair of omnidirectional speakers and they work really well for me. I think they might be even better if the mids and highs were coming from the same point, as opposed to a few inches apart as they are now.
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Old 31st December 2014, 12:37 PM   #6
Flaesh is offline Flaesh  Russian Federation
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Hi Slothrop!
What is your actual omni speakers?
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Old 31st December 2014, 12:37 PM   #7
moray james is offline moray james  Canada
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Originally Posted by Slothrop View Post
Thank you all for your comments. The thing is, I've come to regard some room reflections as A Good Thing. Reading Floyd Toole's book gave me a new perspective on what a loudspeaker ought to try to do, especially as regards directivity. I recently built a pair of omnidirectional speakers and they work really well for me. I think they might be even better if the mids and highs were coming from the same point, as opposed to a few inches apart as they are now.
Remind me of the bench mark loudspeaker(s) which Floyd Toole has designed during his private career as a loudspeaker designer. Seems he had a decent one or two with Harmon? I think Floyd made his mark at the NRC testng. Best regards Moray James.
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Old 31st December 2014, 01:46 PM   #8
Slothrop is offline Slothrop  United States
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Hi Slothrop!
What is your actual omni speakers?
These were a quick-and-dirty experiment, just so I could hear for myself. I am very happy with the sound filling the room. Now I am scheming improvements...
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Old 31st December 2014, 02:10 PM   #9
Flaesh is offline Flaesh  Russian Federation
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Thanks! Don't seems dirty and cool if this made quickly ..
I'll be back next year
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Old 31st December 2014, 05:56 PM   #10
LineArray is offline LineArray  Germany
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Slothrop,

to me it looks like a mix between this

http://www.duevel.com/test/Wundervolle/bl3dcadtop.jpg

and a synergy horn

http://penna-media.hu/danley_web/ima...onstrution.jpg

Since the synergy horn seems mainly a conical horn - but larger flare to the mouth - your aproach in making the mouth cylinder barrel shaped seems "intuitively valid" to me.

So a couple of conical horns may be arranged to cover 360 degrees horizontally and the lower cutoff frequency should be lowered significantly by the mouths of the multiple "cells" adding in radiation resistance.

What you do IMO is basically going 360 degrees and making a cylinder barrel shaped mouth. Then any virtual "dividers" between the sectors may be "omitted".

Of course, this one is not a conical horn, but may illustrate the idea nevertheless ...
http://www.goodsoundclub.com/Site_Images/multicell.jpg

You should keep the vertical dispersion of the synergy horn, so i would expect the free air performance to be similar like a synergy horn. I am not aware how to adapt driver, compression chamber etc. to the larger flare rate, if not going the "multicellular" aproach and also using multiple drivers.

One could go for a conventional synergy design and step by step enlarge the horizontal angle to see, which influence that has and which alignments have to be made to fit your 360 degree approach using one of the known simulation programs. But i think it can be made work well ...

Of course your dispersion won't be "omnidirectional" but 360 degrees horizontal by "X"-degrees vertical, thereby "X" being somewhat frequency dependent.

Did you know this already (?) ...
http://elac.ro/elac%204pi%202%20big.jpg


Also the Walsh bending wave design has a "diffuse onmi" radiation pattern not too different from your "Linaeum" approach shown above

http://www.google.de/patents/US34248...page&q&f=false


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Last edited by LineArray; 31st December 2014 at 06:17 PM.
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