newbie Wanna start a unity Horn project

[hahayan]

I am a newbie for horn, and i want to build a unity horn, my concept is simple
i want to make a unity horn with 2 compression drivers cover anything from 700hz (or lower) to let;s say 14K hz and a super tweeter upto 30Khz

this unity horn may be crossed at 700hz range..or can be lower

i read a lot about unity horns at here, 2 ways units horn, with a compression HF with 2 to 4 mid range cones..

is it possible ?

[MaVo]

not possible. driver to driver spacing must be less than one quarter of the wavelength of the crossover point. but i heard BMS has coaxial compression drivers, which do what you want.

[hahayan]

Originally Posted by MaVo

not possible. driver to driver spacing must be less than one quarter of the wavelength of the crossover point. but i heard BMS has coaxial compression drivers, which do what you want.

let's me check the BMS..., many thx

thx for pointing out this quick note..

by the way, any horn maker still make those dual throat?

[SunRa]

If you want fidelity I suggest you forget dual slot horns, they are against everything we learned about waveguide and horn contours in the past decade or so..

The coaxials pointed out by MaVo are a good starting point though. There are some successful projects out there in the wild, the most known one being the one from BD-Design.

[hahayan]

but i can see..some example of unity, or synergy horn, those separation of drivers..deos not seem to be 1.4 of the crossover frequency, as that idea seem so logical for high SPL and point source, and keeping the structure smaller..too

also wonder..how;s the tonal color of BMS and B&C ?

[hahayan]

wondering.., what is the bad side of having 2 identical MF drivers feed into one horn ?

thx..for any advice..

apart from BMS coaxial compression unit..., any other maker also make something similar?

[SunRa]

Well there would be the same effects as feeding four drivers. The SPL halfs and probably the phase response of the crossover needs to be adjusted. Having just two drivers also means higher distortions (because less SPL).

Maybe there are some advantages also, but I can't figure out what those would be, except price..

As for simillarities between feeding two compression drivers into a horn, vs the synergy concept, well there is much to talk. It all depends on the crossover point and whether the entry hole of the CD's remain acoustically invisible to the other at the selected crossover point. And that basically means bellow 1Khz if I understand this correctly.

Tom Danley actually does this with his JH 90
but then he crosses those CD's (coaxials from BMS) fairly low, around 500-600Hz I guess.

[hahayan]

soething like that... any comment for it?

[el`Ol]

Originally Posted by MaVo

not possible. driver to driver spacing must be less than one quarter of the wavelength of the crossover point. but i heard BMS has coaxial compression drivers, which do what you want.

What speaks against a ribbon and two compression drivers? I see no alignment problems in such a setup.
Driver suggestion for a proof of concept speaker:
http://www.parts-express.com/pe/show...number=264-204
http://www.hifisound.de/oxid/oxid.ph...8ffb0.05235853

[weltersys]

Originally Posted by hahayan

soething like that... any comment for it?

That type of throat plumbing causes severe peaks and nulls, you probably won't find a plot published for that dual driver horn.
Multiple HF drivers plumbed in a manifold to a small throat actually can get loud enough to cause air nonlinearity, "throat distortion".