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-   -   Open source Waveguides for CNC & 3D printing! (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing.html)

ggetzoff 26th October 2018 09:59 PM

Brandon,

Very good points, I think that that the salient points are:

1. Tweeter / waveguide match without a huge increase in energy that has to now be flattened, both in impedance and spectral energy.
2. Motor alignment-wise, any depth should help, so even shallow, radial designs will work.

3. Not doing this just to do a waveguide, but something that performs better, not necessarily an easier filter design, though.

Did you print the SB19 WG?

Cheers,

Greg

augerpro 27th October 2018 12:55 AM

Quote:

Originally Posted by ggetzoff (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post5583990.html#post5583990)

Did you print the SB19 WG?

Cheers,

Greg

Not sure what you're asking? Yes, I've had one printed for SB19, results are somewhere in this thread.

ggetzoff 27th October 2018 03:18 AM

Okay, I see that in post 37. Like I said, I'll be happy to help fund some printing. Exited to see some 6" and 8" data.

Cheers,
Greg

ggetzoff 27th October 2018 03:47 AM

Fascinating how even .02" lip has so much impact. In testing it would be great to be able to just move the dome in and out of the throat on threaded poats with a spring.

augerpro 27th October 2018 05:49 AM

Yeah I played quite a bit with shimming between the dome and throat. The biggest impact was just using that little lip to create a good seal at the dome/throat interface. You'd be surprised at how a little air leak, etc., can muck up the response.

I don't know that I'll do the SB21 any larger than 5". Larger implies crossing lower and why not use the SB26 family to do that? I did do the SB26 at 6" with a .75" and 1" depth. 1" looks decent.

Mayuri 27th October 2018 10:10 AM

Quote:

Originally Posted by augerpro (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post5584236.html#post5584236)
I did do the SB26 at 6" with a .75" and 1" depth. 1" looks decent.

Could you post the .stl files for it? I'm designing a 3d printed 3-way speaker, waveguide on tweeter would fit in nicely with the design.

454Casull 27th October 2018 12:08 PM

Quote:

Originally Posted by augerpro (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post5584236.html#post5584236)
Yeah I played quite a bit with shimming between the dome and throat. The biggest impact was just using that little lip to create a good seal at the dome/throat interface. You'd be surprised at how a little air leak, etc., can muck up the response.

I don't know that I'll do the SB21 any larger than 5". Larger implies crossing lower and why not use the SB26 family to do that? I did do the SB26 at 6" with a .75" and 1" depth. 1" looks decent.

Better off-axis response at high frequencies? Would be ideal for nearfield applications that don't require high SPLs but might need to cover large listening areas.

augerpro 28th October 2018 12:40 AM

Mayuri> Dropbox - 6x1 B v2.stl

454Casull> True enough, although the last SB26 design is looking pretty good until >15khz. I'll toy with some larger stuff for the SB21 anyway.

ggetzoff 28th October 2018 12:52 AM

Brandon,

That's great for the work for the 21. Again, I will be happy to fund printing.

Ive been reading the TT thread-this is fascinating stuff. Thanks for work.

Cheers,

Greg

augerpro 28th October 2018 03:50 AM

Luckily, Dan at CSS is printing for me, but thanks for the offer!


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