Primitive Root Diffuser Calculator

[Bmsluite]

I came across this so I figured I'd share it.

It calculated and generates a diffuser for breaking up frequency ranges.

Would be interesting to 3d print some and place them in enclosures behind the drivers. I believe some Comercial companies have started doing this.

https://actools.tunetown.de/prd/?fb...X1z2MfHmDLEOkQ5W_k_aem_zAn63pBPAArx9HTb5seVKw

 

[Galu]

Would be interesting to 3d print some and place them in enclosures behind the drivers.

To give your thread a bump, here's an image of a primitive root diffuser acoustic panel on a listening room wall.

The primitive root diffuser uses a grid of (typically wooden) posts, each with a different height (to obtain a different reflection delay time).

For the math buffs, the heights of the posts are chosen according to successive powers of a primitive root G, modulo N (a prime number). 😵

 

[Abhishmuk]

Thanks for the calculator! Is KEF's metamaterial "just" a variant of this? IIRC they tune the path length to a quarter wavelength of the absorbed wave. Though, I don't understand how they "cover" the gap between two consecutive paths.

There's (at least) one thread about their meta stuff on this forum for anyone interested in reading more.

 

[planet10]

Thanx for the link. In Y2K i started writing software to do this, but i took the brute force approach and after a whilke i figured out that it was going to take foreverso i never finished it.

dave

 

[planet10]

Is KEF's metamaterial "just" a variant of this?

Not really. More of a maze of smalll channels/labyrinth to attempt to absorb the entire back wave.

The origins of this dat eback to Hegeman’s work, and 3D printers have allowed for making the devies at tweeter scale.

dave

 

[Tenson]

It seems to me this will not have much benefit inside a speaker since the frequency range covered is quite narrow and they create lobes which can be unhelpful at close distance. The later point is why diffusers are recommended only for locations at least a few meters from the listener.

Great for room acoustics though! 3D printing might be an expensive fabrication method when you probably want at least 4 sq. meters.

 

[Bmsluite]

Thanks for the calculator! Is KEF's metamaterial "just" a variant of this? IIRC they tune the path length to a quarter wavelength of the absorbed wave. Though, I don't understand how they "cover" the gap between two consecutive paths.

There's (at least) one thread about their meta stuff on this forum for anyone interested in reading more.

Theirs has channels instead of towers but I believe it works similarly