Open source Waveguides for CNC & 3D printing!

[tktran303]

I’ve uploaded some of @augerpro files to https://3d.jlcpcb.com/

The sites says print jobs are too small. Has anyone come across this issue?

FAQ#342 - User error ?

 

[augerpro]

The site thinks the units are in mm.

 

[tktran303]

Hmm. Is there a hack or quick fix?

 

[fluid]

Tell me which ones you want and I’ll make them metric for you.

 

[tktran303]

No I mean a quick fix on the website https://3d.jlcpcb.com/

There must be an imperial option/switch hiding in there somewhere...

 

[DcibeL]

Just open the file in a 3D CAD program like FreeCAD, adjust scale by 25.4 and save.

 

[fluid]

No I mean a quick fix on the website https://3d.jlcpcb.com/

There must be an imperial option/switch hiding in there somewhere...

Does not appear to be, I've never had to covert any other 3D files I've used from Thingiverse, even the ones from Americans so I imagine there is not much demand. Using Fusion it is only a matter of changing the units in the model and resaving, takes less time than typing this reply

 

[zman01]

tktran303,

Can you try with the STEP file?

Also check out https://craftcloud3d.com/

You can get quotes from multiple sources via the site.

 

[bloozestringer]

I’m thinking about ordering a pair of the 6.5” for the Sb26 out of petg, but I have zero knowledge of 3d printing. On craftcloud it asks for infill %. What should I be putting here?

 

[fluid]

20% is enough, a higher value makes the infill more dense, which increases strength but takes more plastic and longer to print, so costs more.

 

[tktran303]

Yes I need a one stop shop for augerpro's waveguides, fluid's waveguides, AND mabat's horns!

 

[bloozestringer]

20% is enough, a higher value makes the infill more dense, which increases strength but takes more plastic and longer to print, so costs more.

Thanks. I’m hoping this will work as a decent replacement for the Audax TW034 in the troel WG for a pair of Flanagangsters OB’s.

https://www.diyaudio.com/community/threads/open-baffle-bass-reflex-hybrid.393837/

 

[r042wal]

Cool project but is plastic good for a wave guide compared to maybe aluminum? Just curious as this is not my field

 

[DSP_Geek]

Plastic is the usual material, with the advantages of being lighter and less resonant than aluminum (old Altec horns used to ring quite effectively if you tapped on them (once he rang three horns with a pencil. a ******* pencil)).

 

[stoneeh]

Do you also have the linearised frequency response of the tweeter without waveguide at specific levels in comparison? That would be really interesting!

I assume you mean harmonic distortion at various levels with linearized frequency response. I actually got asked for this in private by someone I owe, so I had to do them either way; here you go:



(Reference to Post #1813)

 

[stoneeh]

... the third measurement of last post (@ 100 dB) was wrong, and it doesn't let me edit anymore; here's the correct one:

 

[fluid]

Comparion gif at 100dB for waveguide vs non waveguide equalized, interesting

 

[stoneeh]

Peak gain of this 6,5" waveguide is slightly below 2 kHz, where the driver with this filtering is mechanically stressed the most. The waveguide removes a lot of that stress, driver has to do less excursion to produce the same SPL, distortion decreases with excursion, hence the lower distortion figures in waveguide. Towards higher frequencies, the effect becomes less pronounced.

 

[b_force]

Would be nice to do the distortion relatively (in dB or percentage).
The freq resp rolloff is a bit earlier at the non-waveguide version, so the distortion is actually a little higher in reality.

Roughly about 2-3dB higher around 1500Hz for example.

 

[IamJF]

True - but compared to the >15dB win at 2kHz ... 1500Hz is anyways a big stretch for these drivers and when filtering there you are already 5-10dB down at that frequency -> less stress there.

I found it interesting that H4 is rising about 10dB! Looking forward to my measurements of my waveguide variant - but this will take some time ...