Acoustic Horn Design – The Easy Way (Ath4)

[DonVK]

You need to create a directory "D:\Horns" or change the cfg script to point to an existing directory.

Its this line "Out.DestDir = "D:\Horns"

 

[camplo]

ok I found where the files are going thank you

 

[Patrick Bateman]

What are the features of the new release?

 

[454Casull]

I apologize if this has been asked before, but can this software simulate the diffraction effects and/or off-axis response from something like the DXT “lens” over a dome tweeter?

 

[Patrick Bateman]

1) The Seas DXT tweeter uses a waveguide, not a lens

2) You can simulate it's diffraction using AxiDriver, because the waveguide is symmetrical

 

[mabat]

Yet another horn (measured). It's around 12" in size, 100° coverage, somewhat bigger A9, 18Sound NSD1095N.

Made with Ath4. See how easy it is...

 

[mabat]

BTW, this shape looks like a winner so far. Virtually perfect.

 

[FredrikC]

Very nice!

1 measured free standing, baffle or IB?
2. What throat angle was used to match 1095?

 

[mabat]

It's not mine so I don't know the details, I'm only reporting the success - it would be a pity not to do so.

The angle should be 27 deg. If the guys are reading it here, they can chime in anytime.

 

[FredrikC]

Okey, yes it looks very nice.

Would be usefull to know the ATH parameters and measurement conditions. DI looks quite low, at about 5, could be nice with a cardioid 12” mid bass? Isn’t cardioid and dipole around DI 4.8?

 

[mabat]

I wouldn't take the DI shown at a face value. It may be a bit lower than usual because of the slightly wider beamwidth, that's true. It's also for the front hemisphere only. I can imagine mating this particular design with almost anything.

 

[PKAudio]

On behalf of Michal, who did that WG and measurements, intended just as the first proto verification of WG/driver combo.
Measurement conditions:
- WG was standing on the box of the same width as WG
- mic distance 1m
- measured indoor
- smoothing 1/12
- gating 4ms

Yet another horn (measured). It's around 12" in size, 100° coverage, somewhat bigger A9, 18Sound NSD1095N.

Made with Ath4. See how easy it is...

 

[jzagaja]

Crossover proposal? DE360/12PR300?

 

[mabat]

1,1 kHz

 

[jzagaja]

Topology Marcel I could try print MEH based on even larger A9.

 

[454Casull]

Have you put any thought into creating a DXT-style diffracting waveguide for the SB26ADC? That's exactly what I'd like to do but if you've already done it, I'll just save myself the time...

I have a nearfield monitoring application where I would like the full spectrum off-axis response up to 30 degrees to be as close as possible to the on-axis response. The DXT tweeter does a great job with dispersion up to ~20 kHz but unfortunately does not have good distortion performance below about 1.4 kHz, which is also what I need.

 

[Patrick Bateman]

I could probably throw together a waveguide for the SB26ADC in about one hour, using the methodology here :

3D Modeling Tips and Tricks

But you'd need a way to print it.

Also, I've generally found that any dome over about 3/4" works poorly on waveguides, due to the geometry. (The tip of the dome is too far away from the edge of the dome, causing a high frequency dip as illustrated here : David Ralph's Speaker Pages - Projects )

But if you have a 3D printer, might be worth a shot.

 

[cowanaudio]

Have you put any thought into creating a DXT-style diffracting waveguide for the SB26ADC?

Follow John's earlier advice and try the SB19ST-C000-4 instead. This tweeter has lower THD in a waveguide I designed at 1KHz than a BMS4552. I cross it at 1.1KHz in a MEH. Response was smoother than the BMS as well.

 

[454Casull]

Follow John's earlier advice and try the SB19ST-C000-4 instead. This tweeter has lower THD in a waveguide I designed at 1KHz than a BMS4552. I cross it at 1.1KHz in a MEH. Response was smoother than the BMS as well.

Interesting... at 95 dB/1 m, the SB26ADC is ~68 dB down for both H4 and H5 at 1 kHz. I would be very very surprised if the SB19ST was as good.

 

[454Casull]

I could probably throw together a waveguide for the SB26ADC in about one hour, using the methodology here :

3D Modeling Tips and Tricks

But you'd need a way to print it.

I could get someone locally to do it for me, or heck, bite the bullet and buy a printer for myself.

Seas uses a 1" dome for their DXT, and the response comes out looking perfect. Perhaps the protective mesh helps?