Waveguide design help (Tymphany XT25BG60-04 1")

[Kostya daSilva]

I would like to design a waveguide for this tweeter so I can cross it over low with the SB17NRX2C35-4 (https://hificompass.com/en/speakers/measurements/sbacoustics/sb-acoustics-sb17nrx2c35-4)
I am a little worried about the XO so
1. Should I be worried about the XO point in the first place
2. If so would a waveguide be the best fix
3. If so should I design one and how, or are there any good pre made waveguides that would fit this tweeter.

 

[markbakk]

A WG300 from Monacor plus adapter from Alexander Heissmann does a good job on this tweeter. Check this out!

Not only crossing lower but also (and mere) matching directivity are the arguments that speak for waveguides.

 

[HEXAAA]

I would like to design a waveguide for this tweeter so I can cross it over low with the SB17NRX2C35-4

You can try to test it out in AKABAK/ABEC3 they allow you to simulate the polar response, the easiest way is probably to use the Ath4 program which can quickly generate the waveguide geometry: https://www.diyaudio.com/community/threads/acoustic-horn-design-the-easy-way-ath4.338806/
The setup process for AKABAK is a little jarring at first, but once you've done it, it makes sense.

 

[WhiteDragon]

Yes good to be concerned about XO point.

rule of thumb roughly 2x above resonant frequency.
another helpful guarantee is 3rd order or higher filter.

otherwise to cross over to 6", likely yes a low crossover point.

alternative is finding tweeter with low Fs
around 650 to 750 Hz
as opposed to many 1200 to 1400 Hz

info is usually in datasheet.
usually larger diaphragm around 1" 1/8
or larger rear cavity.

Morel MDT 22 = 650 Hz
RST28 = 710 Hz

Are just a few that come to mind
for quality vs cost

 

[Kostya daSilva]

Already bought parts 💀, but thanks for the advice

 

[Kostya daSilva]

You can try to test it out in AKABAK/ABEC3 they allow you to simulate the polar response, the easiest way is probably to use the Ath4 program which can quickly generate the waveguide geometry: https://www.diyaudio.com/community/threads/acoustic-horn-design-the-easy-way-ath4.338806/
The setup process for AKABAK is a little jarring at first, but once you've done it, it makes sense.

I will take a look at this thanks !

 

[HEXAAA]

I will take a look at this thanks !

This is the tutorial I used when I started:

Note: he uses too coarse a mesh for HF modelling, you should aim for 1/6th the wavelength as the max size of a mesh triangle.
And in AKABAK if you select the global tab at the top then go into fixed driving, enable it and set the weight to 'divide by jw', it should work, it only started working when I selected that, probably because I wanted to get an acoustic impedance output.