I got to hear that T25S sounds very good and wanted to try myself. I like waveguided tweeters so I started making experiments and this is the 1st version that measures reasonably ok. WG is quite shallow, 20mm, with overall diameter ~160mm. WG was 3D printed, low quality, so it may cause some irregularities. In this stage it is just about finding the direction. I do not use any advanced methods to design WG.
Distortion measurements is excellent. FR irregularities ~9kHz somewhat copies native tweeter FR measurements.
And as I have 18W/8542-10 around, I tried to measure it as well to model 2way crossover. This looks definitely good.
Distortion measurements is excellent. FR irregularities ~9kHz somewhat copies native tweeter FR measurements.
And as I have 18W/8542-10 around, I tried to measure it as well to model 2way crossover. This looks definitely good.
Attachments
Doing WG tests I experienced that this notch is often related to distance between dome and WG (surround width) and can be solved either by a small narrow "throat" or by covering half (or more?) of the surround with a "WG-lip".
I can post some measurements, if you like!
Edit: thanks for posting measurements!
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Exactly my thoughts, but.....
T25s native response is already weird by itself.
T25s has inverse surround.
I alredy tried v1 and v2 versions, with smaller throat, covering the surround partially, it did not measure ell. I will spend more time on these, WGs were quite rough, the areas around throat were not precise.
So v3 showed good direction, and I will be trying this version with different throat diameters again.
T25s native response is already weird by itself.
T25s has inverse surround.
I alredy tried v1 and v2 versions, with smaller throat, covering the surround partially, it did not measure ell. I will spend more time on these, WGs were quite rough, the areas around throat were not precise.
So v3 showed good direction, and I will be trying this version with different throat diameters again.
I completely understand - you probably know much more about WGs than I do!
I'll post my comparison anyway, maybe it can be of some use for you or someone else ...
you might also know this posting in augerpro's waveguide thread:
https://www.diyaudio.com/community/...uides-for-cnc-3d-printing.318190/post-5612438