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Old 17th January 2008, 06:56 AM   #1
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Default DIY Omni Directional Speakers

Did a search here and couldn't come up with any serious designs.

There are a few commercial systems out there that look to be well thought out (and expensive) but they all tend to be inefficient.

I'm thinking of using very high quality high efficiency drivers and building a three way. The bass should be easy, it will be down firing into a 360 degree reflector. The midrange will be crossed in at 300 and will fire up into a 360 degree reflector and extend to 3K and the treble will be a special 360 degree horn.

The goal is to drive the room with equal power response with little compromise in dynamics.

I have one working and it is pretty amazing. It's around 100db sensitive and measures (and sounds) darn near the same every where in the room with pink noise I've tried this before but not with the reflectors, I used multi drivers like bose - this seems to be far superior.

Wonder how a pair will sound?
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Old 17th January 2008, 07:23 AM   #2
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Old 17th January 2008, 07:28 AM   #3
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Quote:
Originally posted by planet10
http://www.diyaudio.com/forums/showt...47#post1323047
Well it's pretty. Not really omni though
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Old 17th January 2008, 07:41 AM   #4
AJ is offline AJ  United States
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I know you're looking for something serious, but I played around with this idea a coupla years ago. Made some MDF cones adjustable over a sonotube baffle. It never went anywhere and I had a name for them - The Screaming Banshees.

I didn't much like the 360 degree reflector and ended up with a very nice sounding takeoff on the Pluto. Not high enough efficiency though.

Click the image to open in full size.
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Old 17th January 2008, 07:47 AM   #5
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AJ,

Those are close to what I have here in concept!

I'm liking the sound in mono but am afraid it will die when I go to two channels.

What was it that you disliked with the Screaming Banshees? How would you improve it ?
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Old 17th January 2008, 08:04 AM   #6
AJ is offline AJ  United States
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Mostly I just didn't like the presentation - the image and soundstage floated around to the point of annoyance. I just wanted to yell out, "Stay in one spot!"

The screaming banshee came from not being able to tame some peakiness around 5khz - I mean it was the mount Everest of peakiness and I never could figure out where it was coming from. I based the size of the large cone on the fact that 1khz was pretty much maximum for omni radiation from an upfiring driver of any decent size and so everything above that would be reflected as the cone got smaller matching the increasing frequency wavelengths. It may not have been a viable idea, but it seemed to make sense.

I like your idea of using a 360 degree horn. I often wondered how to get the efficiency up and I never thought of that.

BTW, I only tried using the Fostex FX200 and the Fostex FT17H you see in the picture and a one day experiment with the PR170. Different drivers might have been a better choice. I'm honestly not sure how to improve it.
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Old 17th January 2008, 08:28 AM   #7
poynton is offline poynton  United Kingdom
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Years ago........

I had a pair of Sony speakers which used exactly that arrangement, although the reflectors were in plastic.

They sounded reasonable, I think!!!

Andy
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Old 17th January 2008, 08:53 AM   #8
SamL is offline SamL  New Zealand
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BrianP tried to start the discussion over madisound sometime last year.
http://www.madisound.com/forum/dc/dc...ng_type=search
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Old 17th January 2008, 10:15 AM   #9
el`Ol is offline el`Ol  Germany
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This is a new concept:
http://www.planotspeaker.com/
I talked to the inventor and he was very euphoric about the fact that a single speaker already has some kind of stereo effect. He thought he could revolutionary stereophony, but I believe it is useful as an ambience speaker only.
No matter what will be the case, patenting before one has a stereo pair ready isnīt that smart.
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Old 17th January 2008, 10:36 AM   #10
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by el`Ol
This is a new concept:..........

I can see MANY problems with the design !!!!!!!!!!


Andy
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