Acoustic Horn Design – The Easy Way (Ath4)

[mabat]

The RCF has a 3-slot phase plug, the Lavoce a 1-slot phase plug.
These two are very different in the details, it will be interesting to compare them subjectively.

 

[mabat]

DF10.171K, A520G2, now with the 25-STD-2 (levels won't match):

The exit angle of the driver is somewhere between the STD-1 (12 deg) and STD-2 (31 deg).
It's probably worth making an exact adapter.

(The RCF NDX595 is also very very good, no doubts.)

 

[mabat]

DF10.171K, A520G2/25-EXT-1

I think this has a potential...

 

[mabat]

NDX595, A520G2/25-EXT-1

This is how waveguides are done in 2024

 

[mabat]

The effect of the extended throat with NDX595 (the off-axis angles won't match precisely):

 

[olegtern]

Hi @mabat, I have a question. If I upscale Gen2 WG and adapter for a 1-inch driver up to x1.4, what kind of HF directivity can I expect? Will it be about ~1.4'' driver or ~2''+ driver? I'm considering doing something like this with a MEH to achieve ~100Hz with WG directivity. I'll be fine with a rough answer without any modeling.

Maybe it's time for me to start learning how to use ATH soft...

 

[mabat]

Scaling is easy. This is with the 25-EXT-1.

0-180 / 5deg

 

[mabat]

DF10.171K + ATH280EXmk2
(on axis and some arbitrary off-axis angles)

It seems that the (built-in) extensions in these smaller WGs may have too abrupt terminations (due to their wider coverage angles), I don't know. Of course with a DSP this is no issue, but still...

 

[mabat]

The old ST260

DF10.171K

NDX595

 

[mabat]

NDX595 + ATH330EX

 

[mabat]

.. the Lavoce a 1-slot phase plug.

I must correct this. It seems like a single slot from the exit side just by a brief look but it's actually a 2-slot design.

The DF10.171K:

Anyway, obviously the exit wavefront is really well behaved. They claim a FEM optimization and I believe them.

The back chamber is without any damping and it should be easily possible to make a custom rear cover for this driver.

BTW, there's a similiar driver, DF10.171M, with a different diaphragm. I leave that for others to try.
Overall, I think this is a pretty good substitute for the (no longer available) Peerless drivers.

 

[mabat]

I forgot to mention that it also sounds very natural. It would be strange if it didn't.

 

[TNT]

One wonder if after reassembled it becomes really air tight... back ver against metal, the terminals coming out of the back... does this matter?

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