Acoustic Horn Design – The Easy Way (Ath4)

[hum4god]

B&C DCX464

perhaps try the new dcx464 , could get close to 300hz


DCX464 Coaxials HF - B&C Speakers


B&C DCX464

 

[fluid]

I don't have a Windows computer and for some reason I couldn't get it to work in Parallels and gave up.

I used Virtual box when I had a Mac and for programs like this that are not CPU intensive it worked a treat. I had a couple of old programs that would only work with XP so I had a version of that too. You only need enough hard drive space for the OS and a little bit more as you can access all the files on your other drive as if it was on a network.

 

[Mindsource]

perhaps try the new dcx464 , could get close to 300hz

I thought that coaxial CDs do weird things with the wavefront when the two waves converge, hence less desirable?

 

[bmc0]

I have not. I don't have a Windows computer and for some reason I couldn't get it to work in Parallels and gave up.

FWIW, Ath4 and ABEC3 (as well as the new AKABAK release) work just fine on Linux with Wine.

 

[U101222]

That's one of the reasons I'd opt for a larger driver that can be used lower in frequency. With a large mouth flare (doesn't necessarily imply a larger waveguide) there's almost no midrange narrowing and I don't think that the "sparkle" has any connection with a frequency response extension to 20 kHz.

My favourite approach is 2" driver into a horn/WG and then top it with a super tweeter, possibly quite steeply filtered (4th order Bessel high pass - yes Bessel has a bit of ripple but who cares at around 16K, but it has no phase rotation at the cut frequency). if I really need that sparkle.

 

[U101222]

Two side by side.

Horn porn!

 

[mabat]

1:2 Tritonia model ready to print -

Looking good so far

 

[U101222]

[...] we commonly see 2 inch drivers are not capable of exceeding useful output past 14kHz.

Who cares? You can use 2" drivers starting from lower frequencies than 1" frequencies, so you can get a better coverage of the core frequency range (mids to the treble). Then you can add a sharply filtered super tweeter if you really need the top treble (I use a Visaton TL16-H with a 4th order Bessel at 16K to cover 16K-35K, even though at about 2db less than the rest - it gives perfect air without harshness).

 

[U101222]

This is also funny: Today, solely by mistake, I tried something I didn't want (what could be considered as an error), but hey, the result is one of the best I have seen -

What would be this shape? What is its peculiarity?

 

[mabat]

Yes!
Not perfect but probably good enough.

 

[mabat]

What would be this shape? What is its peculiarity?

I think that shape gave rise to the Tritonia waveguide you see above, with about the same performance without looking so weird.

 

[TNT]

Looking good so far

Is that an ANYCUBIC i3 Mega S and if so, would you recommend it?

//

 

[mabat]

I'm no experienced printer, so I can't really compare. This is my first, it was cheap and I supose it's nowhere as good as the more expensive stuff. But the only thing I had to do was to rectify the axes a bit (drill a bit bigger holes, etc.), otherwise it simply prints what I need. No issues but maybe you have to be lucky about a particular piece, I don't know.

I think one belt is too loose but I always forget to fix that.

 

[U101222]

I'm thinking about releasing the code as an open source (C++ classes) - I'd love to see it implemented with a proper GUI and a real-time visualization of the waveguide being designed. Initially I thought that I will be able to write it myself but now I see I'm really not as it takes much more time than I'm actually willing to give it (now, after I have finally found my waveguide!). Would there be any volunteers to make this happen?

I can help with porting to other operating systems (even if just for the CLI version).

 

[U101222]

Tritonia in vertical and diagonal (infinite baffle):

I wonder how a Tritonia would work with a coaxial driver, such as the B&C DCX50 (of the newer DCX462/464). Is there a reason such a driver would not work? The DCX50, for instance, has a minuscule cone for the tweeter inside.

What I really like is the shallow depth. This would allow the waveguide to be flush with the rest of a cabinet and almost get time alignment between a woofer and the driver...

 

[U101222]

Only a coarse calculation for now (still took over 1 hour) -
Ignoring the obvious numerical issues, it's probably not bad.

There are two different pictures for "triton freestanding + rollback" and one shows falling sound pressure and the other one nearly constant: what is the actual difference?

 

[fluid]

One is the raw response the other is generated from the normalized polar, and represents what it could look like if EQ'd flat to the normalizing axis.

 

[JSS]

Yes!

Not perfect but probably good enough.

Looking great, like the color.
I just ordered an anycubic chiron so I can print bigger ATH horns

 

[JSS]

I really want to do a synergized ATH horn.
What do you guys recommend as best for this application?
Axisymetric or Tritonia synergy horn?

 

[Brinkman]

Interesting question because co-entrant horns (ie unity, synergy, multi-entrant, et al) tend to use closed back drivers in the transition from HF to mid-bass so such a waveguide could remain freestanding.