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-   -   Acoustic Horn Design The Easy Way (Ath4) (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4.html)

454Casull 29th October 2019 04:42 PM

Quote:

Originally Posted by mabat (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post5955666.html#post5955666)
So please set the right entry angle for this driver. It should be easy enough to keep the current size. I sketched this one very quickly but now when I compare it to some other results it seems to be really good!

The challange now will be to find a good woofer. Because of the relatively small size it needs to be crossed quite high, like 1.5 - 1.8 kHz... There will be not many readily available drivers capable of that.

SB17NAC35/SB17NBAC35 might do the trick.

SB Acoustics SB17NBAC35-8 | HiFiCompass

jzagaja 29th October 2019 11:32 PM

Marcel, do you have any requirements for measurement like baffled/none, angle set, distance, excitation signal in Volts RMS?

mabat 30th October 2019 07:26 AM

It's up to you and your facilities. From the drawing you gave I assumed a box (?). The distance should not be less than about 1 m, preferably more, but that depends on a reflection-free space at your disposal. Measured gated, of course, 4 - 5 ms should be fine. Make it the same for both horns and the rest is not critical.

mabat 30th October 2019 07:41 AM

Quote:

Originally Posted by 454Casull (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post5959125.html#post5959125)
SB17NAC35/SB17NBAC35 might do the trick.

We'll see how the measurement turns out. That should determine a suitable diameter(s) of the woofer, among other things. Right now I would say that a 6" is too small, but who knows.

- So far I must say I'm glad I kept the Behringers...

Patrick Bateman 30th October 2019 07:58 AM

Quote:

Originally Posted by mabat (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post5959745.html#post5959745)
We'll see how the measurement turns out. That should determine a suitable diameter(s) of the woofer, among other things. Right now I would say that a 6" is too small, but who knows.

- So far I must say I'm glad I kept the Behringers...

They're SHOCKINGLY good.

I enjoy this hobby, but if you simply want a nice stereo those Behringers are incredible for the money.

jzagaja 3rd November 2019 07:05 PM

5 Attachment(s)
Three waveguides shootout.

mabat 4th November 2019 06:25 AM

Thank you. Was this unbaffled? I assume these polar maps are normalized to axis. Could you please show all the raw polars also as frequency response plots?

Only one remark - your IR window should start where the impulse starts, i.e. where the impulse response starts to deviate from zero. You seem to start the gate somewhere around the maximum of the impulse - that is generally wrong.

- Definitely it looks promising, for such a small horn. Now you can imagine how a bigger device would perform...

jzagaja 4th November 2019 07:09 AM

2 Attachment(s)
Unbaffled. Baffle was planned but couldn't find time. Normalized to 10deg.

Gate at maxiumum peak was only used for illustration - time difference between main pulse and second pulse. Why Keele's waveguide has second pulse?

One interesting phenomenon - I used RME babyface. In dual channel mode expreienced floating impulse response. Ivo suggest it could be driver nonlinearity and good to check other stimulus especially pink noise.

mabat 4th November 2019 07:22 AM

The second impulse arrives at ~0.8 ms, that is about twice the depth of the horn for a sound wave to travel, so that might be a reflected energy from mouth to driver and back again.

BTW, that's not that bad for unbaffled situation. Square seems to suffer less than an ellipse in this case.
At 7 - 8 kHz there wil be some imperfection in the driver, I've already seen this somewhere else.

jzagaja 4th November 2019 07:30 AM

If so we should observe similar in A9.


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