3D printed waveguides

[augerpro]

I think I'll do the same run tomorrow on the .75" deep, non-tangent mouth guide.

[augerpro]

Another phase shield comparison, this time on the deeper 1", tangent mouth waveguide.

With original .47" wide PS:


With approx. .38" wide PS:


With approx. .25" wide PS:


And last, no phase shield:

[augerpro]

Moving on to the shallower .75" deep, non-tangent mouth waveguide.

Original .47" wide phase shield:


Skipped the .38" wide PS and went straight to .25" which seems like the sweet above:


And no phase shield:

[augerpro]

As people have discovered before, what is going on right at the throat is the most critical factor. I've got some other phase shield designs to play with, but I'm also going to have the wg that overhands the surround made soon, I think that will be another critical test. I also wonder how the throat angle effects things, but it might take going to the larger wg's to provide room to play. As it is the tangent mouth wg's around low/mid 50 degrees, while the non-tangent wg's are around 40 degrees.

[ernperkins]

Inspired by Sean Olive's paper I now do Direct Sound (0+10) and Early Reflection (30+40+50+60). As you said, it has really brought a better perspective to the response, especially the ER portion.

Brandon, do you have a link or a copy of the Sean Olive paper?

[augerpro]

Brandon, do you have a link or a copy of the Sean Olive paper?

Here you go: https://www.dropbox.com/s/0t38u949om...mance.pdf?dl=0

[ryanbouma]

Whoah huge thread. I havent read. I was really pushing this idea a number of years ago and eventually just went seos. A lot of people here were skeptical. I hope you come up with something cool. Ive been toying with my cnc machine and 1.75" thick mdf. I dont have 3d CAM software though so its tricky. And 3d software is expensive for cncs.

[300Z]

Here you go: https://www.dropbox.com/s/0t38u949om...mance.pdf?dl=0

Thank you Brandon.

[augerpro]

Whoah huge thread. I havent read. I was really pushing this idea a number of years ago and eventually just went seos. A lot of people here were skeptical. I hope you come up with something cool. Ive been toying with my cnc machine and 1.75" thick mdf. I dont have 3d CAM software though so its tricky. And 3d software is expensive for cncs.

I think Fusion 360 will generate tool paths for your CNC, and it's free to hobbyists.

[TN Allen]

Whoah huge thread. I havent read. I was really pushing this idea a number of years ago and eventually just went seos. A lot of people here were skeptical. I hope you come up with something cool. Ive been toying with my cnc machine and 1.75" thick mdf. I dont have 3d CAM software though so its tricky. And 3d software is expensive for cncs.

Ryan, I sent you a pm.

[ernperkins]

Thanks, working my way through it and trying to find Toole's papers for the definition of the different types of tests (e.g. LW, PIR, etc.)

Here you go: https://www.dropbox.com/s/0t38u949om...mance.pdf?dl=0

[ryanbouma]

I think Fusion 360 will generate tool paths for your CNC, and it's free to hobbyists.

Yes I think you're right but its a huge learning curve and setup change. I probably should look into it though.

[augerpro]

Yes I think you're right but its a huge learning curve and setup change. I probably should look into it though.

I've found F360 to be really easy to learn, compared to Sketchup which I hated. FWIW.

[dlneubec]

As people have discovered before, what is going on right at the throat is the most critical factor. I've got some other phase shield designs to play with, but I'm also going to have the wg that overhands the surround made soon, I think that will be another critical test. I also wonder how the throat angle effects things, but it might take going to the larger wg's to provide room to play. As it is the tangent mouth wg's around low/mid 50 degrees, while the non-tangent wg's are around 40 degrees.

[augerpro]

I'm playing with an elliptical flare right now, aiming for around 60-ish degrees at the throat. I actually used Dave's waveguide on the NE19 which worked pretty well. This time around I'm aiming for the least amount of depth possible that still provides the performance I want, and good AC matching.