Open source Waveguides for CNC & 3D printing!

[Mitch311]

Ahhh and the units that it's loading in aren't set.
So I see it's longest measurement at 7.28 units for the 6.5" version.
So 7.28 * 25.4mm = 184.91mm, does this sound right?

 

[fluid]

That's right. You can open the step file in Fusion 360 and change the units to millimeters if that works better for you.

 

[Mitch311]

Thanks mate.

 

[superlian]

A little different question:

Is it possible to make a inwall waveguide to JBL 2451 (with Truextent beryllium)?

It can be as wide as 75 cm but not deeper than 19 cm. Height around 45 cm.

Crossed over to an high quality 12 or 15 inch midwoofer.

 

[stoneeh]

I collected some higher res directivity, and SPL calibrated sensitivity data, on the open source waveguides for the SB Acoustics SB26ADC-C000-4. Use well.

 

[stoneeh]

Add.: comparing the measurements in line chart form, the data from the Somasonus website doesn't quite match with what I've measured.

Comparison horizontal directivity for the 6,5" elliptical version w/ PS, SB26ADC-C000-4; scales, SPL and overylay colors matched; left Somasonus, right myself:



The Somasonus measurements show a broader beamwidth at the lower, and a narrower beamwidth at the top end of the frequency spectrum.

My measurements were done in free air, on stand / platform, 1m height, 1m distance DUT <-> mic, 2 ms gate, Class 1 FR mic with frequency & SPL calibration, graph 1/6 oct smoothed. Can you, @augerpro , name your measurement methodics, environment, variables, so we can diagnose the source of the differences?

 

[augerpro]

My baffle for waveguides is approx. 1m x 1.2m with driver offset from center. I get measurements similar to yours when the waveguide is in an actual speaker.

 

[stoneeh]

Perfect.

 

[JanRSmit]

@augerpro, a question. Did you also test circulair waveguide for the sb26adc?
I am considering the 4" , i am just asking ;-)

 

[augerpro]

I think I did revisit the circular SB26 in 5". I don't remember how it looked. I'll take a look again but it won't be anytime soon. I'm finishing my last classes for a degree and there may be a serious health issue in the family that may take me away from doing anything for awhile.

 

[JanRSmit]

Succes with getting your degree, and strength in dealing with the heather issue in the family

 

[augerpro]

Thank you Jan

 

[zman01]

Brandon,

Wishing you good luck with the studies and degree.

Sorry to hear about the health issue in your family, my prayers and good wishes.

 

[augerpro]

Thank you

 

[Bogda89]

Hi guys, do you have any sugestion for 3d printing service? what material will work best? i have an access to shop bot cnc router. is it posible to cut a vaweguide directly into the mdf baffle? i have only basic knowledge in cad design, enough to make and cut speaker boxes on shop bot.

but you are doing amazing work!

 

[zman01]

Bogda89,

I did one my ones is MJF using the Craftcloud website - they will get you offers from multiple 3D printing services, and you can choose.

https://www.diyaudio.com/community/...r-cnc-3d-printing.318190/page-78#post-7318610

 

[vineethkumar01]

Wishing you all success in your studies @augerpro
Prayers and good wishes regarding dealing with health issues in the family

 

[augerpro]

Thanks Vineeth. At least I'll be graduating in a couple weeks and I can finally have my life back! Fulltime school and fulltime work is no fun.

 

[okankav]

hi,

I reviewed most of them and sb21 looks very good. I am considering a built 2 way system with sb21 sdc.

When I looked the graphs it looks it can be crossed 2 khz(even 1 khz) Does anyone have experience with this?

 

[stv]

I'll be graduating in a couple weeks

All the best and good luck!