Acoustic Horn Design – The Easy Way (Ath4)

[mabat]

BTW, the ST260 with no rollback -

 

[mabat]

With the rollback it's already widely known I think -

 

[tmuikku]

Oh the woofer driver in the simulation has greater diameter than the waveguide and starts to beam. I think the woofer(system) should be about same size as the waveguide. Basically what fluid showed few posts back, woofers are at the very rim of the waveguide. Either that or the multiple entry horn seem to be two best options.

And if you think about it, combine the two options to one idea, a woofer somewhere along the waveguide profile. A freedom to choose what kind of diffraction one prefers Diffraction seems unavoidable on fullrange loudspeaker, certainly can try to minimize it.

 

[Brinkman]

Is Bill Waslo’s solution from the 3D printed unity horn thread not applicable here? He originally had the woofer taps towards the mouth flare of his printed horn. Later measurements indicated the two woofers worked better side firing on either side of the waveguide.

 

[Kevmoso]

It would be extremely interesting to see someone make an MEH with such a low-diffraction waveguide. Were it within my skills, or if I already had a printer set up, I'd try for certain, even if I didn't plan to build it into a speaker.

Ken

Working on it.

 

[gedlee]

Now with the horn -

Actually, I meant with the mouth flush with the mids.

 

[Brinkman]

Earl, OT but I’ve been meaning to ask you for a resource I can consult for hanging drywall like you did in your listening space for LF absorption.

 

[Brinkman]

@Marcel
Forgive me if this is a silly question, but can your program be used to design a waveguide for a ribbon tweeter such as the Raal 70-20XR?

 

[mabat]

Oh the woofer driver in the simulation has greater diameter than the waveguide and starts to beam. I think the woofer(system) should be about same size as the waveguide. ...

To me it doesn't seem to be a bad thing if the woofer beams more around and especially below the crossover frequency. This way a higher DI can be extended to a lower frequency than if both would match exactly. There's never a sharp discontinuity in the resulting radiation pattern but kind of a blend of the two. But I haven't done any simulations including a crossover yet.

 

[mabat]

Working on it.

Can't wait to see how it performs.

 

[mabat]

Actually, I meant with the mouth flush with the mids.

With or without a rolled-back lip?

 

[mabat]

@Marcel
Forgive me if this is a silly question, but can your program be used to design a waveguide for a ribbon tweeter such as the Raal 70-20XR?

In the current implementation, no, it uses only circular throats. Maybe in the future.

 

[TNT]

WG integration.. I couldn't help fiddling some more on my potential project... I was able to reduce the c/c by > 10 cm byt letting the WG lower part become an integral part of the upper woofer. I figured the rim, surrond and the beginning of cone re-form part of the rollback of the WG. My 3D job has somewhat lacking but I think you get the gist of it... it's been seen before and I think I could lower it yet a few centimeter...

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[pelanj]

Rectangular throats in ATH have been my dream since the program was released

 

[mabat]

WG integration..

Why not just shift the waveguide forward and put it over the woofer a bit? That shouldn't do any harm.

 

[TNT]

Hmm - yes, the surrond of the woofer could actually be allowed to "play" into the backside of the rollback... Yes - that could actually be even better..

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[mabat]

If you wanted a better look, I could extend the CE series with somewhat deeper waveguides with a narrower/less controlled coverage and higher loading (I'm only not sure it could still be called cutting edge...)

 

[tmuikku]

TNT, Kimmosto demonstrated earlier this year that smoother power response can be achieved with cc ~1.4 wl, and worst case is about .5-.7 if i remember, this removes need to push the waveguide over the woofer unless you can drop down the xo enough to achieve near 1/4 wl c-c with the ath waveguide. Less diffraction problems at least.

 

[Patrick Bateman]

It would be extremely interesting to see someone make an MEH with such a low-diffraction waveguide. Were it within my skills, or if I already had a printer set up, I'd try for certain, even if I didn't plan to build it into a speaker.

Some food for thought:

Metlako: A Small, Affordable Two-Way Unity Waveguide

 

[TNT]

TNT, Kimmosto demonstrated earlier this year that smoother power response can be achieved with cc ~1.4 wl, and worst case is about .5-.7 if i remember, this removes need to push the waveguide over the woofer unless you can drop down the xo enough to achieve near 1/4 wl c-c with the ath waveguide. Less diffraction problems at least.

Thanks - good to know that I could skip that actually....

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