Wide dispersion/omnidirectional pointsource

Status
Not open for further replies.
As I see it, it has the same flaw as the Duevel. Its just a up firing speaker with some more or less uncontrolled early reflections.

I use up firing full range but without reflector or guide. I eq to more or less flat in room response. This works great for me. It's not based on CD, but sound does not change much, and presents a uniform sound no mater whare I am.
 
"uncontrolled"? What do You mean by an uncontrolled reflection vs a controlled reflection?[/QUO

I can’t imagine there being any sort of constant directivity behavior over a broad frequency spectrum. As I mentioned earlier there must be phase and lobing issues with a woofer playing into a cone located at an arbitrary distance and roughly the same size as the cone it self. I know it is speculation from my part. Do you have anything to add to the subject or are you gearing up to a discussion about semantics?
 
So, just when I thought I was ready for a prototype of the “perfect speaker!”, Bateman pointed me towards another thread regarding people’s preference for wide dispersion speakers. My planned design weren’t wide dispersion, direct radiator style.
My question now. What would an omnidirectional constant directivity point source look like? A synergy type horn shaped like the Duevel speakers? I can’t wrap my head around it. So any thoughts on the subject would be interesting to read. Also if people got any design ideas?


zeXR1Zk.jpg


You can arrange Unity horns in a ring

Bang___Olufsen.0.0.jpg


Beolab 90 can radiate omnidirectionally, or it can radiate into a narrow beam

An externally hosted image should be here but it was not working when we last tested it.


Beolab 5 has a wide beamwidth

Having said all that, it's quite hard to beat the cornerhorn approach promoted by Cask05. I've heard the Beolab 90s and the Beolab 5 and the MBL speakers. The corner horns I'm using, designed by Bill Waslo, are right up there.

The Beolab 5 is clever though. It doesn't look like a waveguide speaker, but it is, the waveguides are basically pointed UP instead of forward and there's a reflector at the throat.
 
I think we so often overlook the advantageous sound a room can provide......it’s the ambient field that can make imaging so breathtaking........or a catastrophe. In Walls and corner speakers eliminate those spacial effects.......so IME a very clinical detailed presentation........and equally dull and lifeless.

I’m always looking to surpass my narrow 4” wide floorstanders and subs placed 4 ft out into the room and have not been able to do so. The only drawback is limited dynamics with conventional dome tweeters and 3.5” fullrangers suffer from power compression on dynamic peaks.
 
Not point source. Omni synergy seams to be the only option if it could be built.

An externally hosted image should be here but it was not working when we last tested it.


The Beolab5 gets pretty darn close, because those platters allow for very tight vertical spacing. With 3D printing, you could probably get the vertical spacing down to about ten centimeters. With a crossover point of 1870 and the correct filters, that will give you omni radiation on the horizontal axis and seventy degrees of beamwidth on the vertical.

It basically creates an adjustable beam on the vertical, which is determined by the crossover points and slopes, and an omni beam on the horizontal.

There IS some rejection to the back, due to the conical baffle. So technically, it's like a cardioid on the horizontal and controlled directivity on the vertical.
 
An externally hosted image should be here but it was not working when we last tested it.


The Beolab5 gets pretty darn close, because those platters allow for very tight vertical spacing. With 3D printing, you could probably get the vertical spacing down to about ten centimeters. With a crossover point of 1870 and the correct filters, that will give you omni radiation on the horizontal axis and seventy degrees of beamwidth on the vertical.

It basically creates an adjustable beam on the vertical, which is determined by the crossover points and slopes, and an omni beam on the horizontal.

There IS some rejection to the back, due to the conical baffle. So technically, it's like a cardioid on the horizontal and controlled directivity on the vertical.

How predictable is the “waveguide” on these things? Does it follow a certain mathematical shape? I remember you made a 360 degree paraline (YouTube). Have you ditched that idea? If so, how come?
 
Status
Not open for further replies.