Circle array

[Tyimo]

Hi!

Would it be possible to arrange the speakers round or hexagon, octagon, etc. instead of the classical line array arrangement?
Anyone done this before?

Greets:
Tyimo

 

[Scottmoose]

As in on a flat baffle, or on multiple facates / baffles firing in multiple directions. Both can / have been done, though of course present different challenges in design terms.

 

[pnix]

Hi!

Would it be possible to arrange the speakers round or hexagon, octagon, etc. instead of the classical line array arrangement?
Anyone done this before?

Greets:
Tyimo

Keele describes a 'spherical cap array' in one of his CBT papers. Please see page 55 and following in
http://www.xlrtechs.com/dbkeele.com/PDF2/Keele (2000-09 AES Preprint) - CBT Paper1.pdf

 

[freddi]

hi pnix - would Stanley Clarke's tweeter section of his old stage bass rig be a "spherical cap array" in form?

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

 

[Dynaflo]

Design Acoustics D-12 (1973) might be an example of what you are talking about.

 

[GM]

Would it be possible to arrange the speakers round or hexagon, octagon, etc. instead of the classical line array arrangement?
Anyone done this before?

Greets:
Tyimo

Works great to make a huge convex, or even flat baffle, point source 'full-range' driver, but not a single driver circular array per se.

GM

 

[pnix]

hi pnix - would Stanley Clarke's tweeter section of his old stage bass rig be a "spherical cap array" in form?

This design probably tries to have a very wide dispersion. The spherical cap array tries to create narrow dispersion.

 

[freddi]

thanks pnix for explaining the difference.

 

[Barleywater]

Here is radial array of twelve full range drivers sandwiched between two 10" woofers:

 

[Tyimo]

Keele describes a 'spherical cap array' in one of his CBT papers. Please see page 55 and following in
http://www.xlrtechs.com/dbkeele.com/...T Paper1.pdf
__________________

Thanks for the nice link!

 

[Tyimo]

Works great to make a huge convex, or even flat baffle, point source 'full-range' driver, but not a single driver circular array per se.

What do you mean on "not a single driver circular array per se" ?

 

[GM]

IOW, if you just use 'FR' drivers to create a big circle, it won't work well, at least not to my ears or the others who auditioned the one I cobbled together using cheap mobile audio 'FR' speakers long ago.

GM

 

[Tyimo]

I meant something like this on the drawing. Creating a high sensitivity, quasi "big surface" driver.
Another version: 6 or 8 small fullrange driver and one big bass driver in the middle.

 

[CLS]

That makes me think of this: http://www.diyaudio.com/forums/multi-way/90804-large-midrange-ob-scott-g-10.html#post1953221

 

[wesayso]

Makes me think of this one from Melo theory:
http://www.diyaudio.com/forums/multi-way/263353-portal-controlled-dispersion-tripole-9.html#post4157176
Except he puts a high frequency waveguide tweeter in the middle I think...

 

[Tyimo]

Yes! Thanks!

http://www.diyaudio.com/forums/multi-way/263353-portal-controlled-dispersion-tripole-4.html

 

[TBTL]

Six drivers around a seventh driver act as one big driver, so they will beam horribly. If the ring of drivers is arranged around a waveguide, you might be able to cross over before the array beams too much. But I doubt the waveguide can control it's pattern down to the crossover frequency.

 

[walters]

Leviathan awesome

 

[GM]

Six drivers around a seventh driver act as one big driver, so they will beam horribly. If the ring of drivers is arranged around a waveguide, you might be able to cross over before the array beams too much. But I doubt the waveguide can control it's pattern down to the crossover frequency.

True, but beaming can be a good thing to keep first reflections behind the listening position [LP] and if you focus them to mimic a point source driver you can get away with rolling the 'ring' off fairly high.

Still, the ones that worked best for me were four 15" [mid]bass woofers with a large horn in the middle XO'd @ 500 Hz.

GM

 

[CLS]

....

Still, the ones that worked best for me were four 15" [mid]bass woofers with a large horn in the middle XO'd @ 500 Hz.

GM

😱

But why 4? 6 should be even better 😛

And then, this comes to mind: