Quadratic Diffusers

@hilde45 - I was surprised to learn from a good friend and cabinet maker, that balsa is actually a hard wood (by definition).

This is the very first effort making diffusers, and that being cherry wood only. No idea how that would work out, I am surprised that it would degrade though?

I only used balsa wood as a kid, I’d glue wings on a dowel and shape them for lift. Tear apart a golf ball, which was not easy, unravel the rubber band that was under the skin (are they still made that way, I have no idea?) and make a loom from the rubber and use the local park’s slippery slide as a large slingshot to send it up into the sky. Like boomerangs, every now and then losing them in a tree, at least until the next big storm. Other kids would end up with new (to them) toys. Surprisingly light, the balsa planes could withstand a flogging, they fell a long way after being shot up into the air.

** I used the plans I purchased from Acoustic Fields for my QRD17** With a little modifications in the CNC program, the resulting geometry being the same as the plan, just didos are different.

Thanks rix. I also have one of mine (30" X 40") on the front wall between the speakers. That one is about 3' off the floor. Very happy with the results even though they are not quadratic. For the side walls I'm using a combination of absorption & diffusion. 

@boxer12 - now I'm even more motivated to get them placed for listening, thanks!

Wow!  Those really are alien.  Cool and freaky.  I run the GIK diffusers with great affect behind ATC 40A towers.  Dark wood with slots.
 
https://www.gikacoustics.com/product/4a-alpha-panel-diffusor-acoustic-panel-bass-trap/

They are self standing 45"X 23" so I didn't have to mount them.

@boxer12 - So I have finally (with help from a neighbour) put them up on a steel frame, about 14" off the floor. They are on either side between and behind the stand mounts on the front wall, 6" overhang outside of the back of the toed in stand mounts.
It's a bit rough and ready at the moment, and all about the sound and not looks, I'm afraid. My wife heard it immediately, it sounds richer.

I have the rear port of my speakers firing directly into some of the deeper wells in the diffuser, the bass is more defined. So much so, I'm really motivated to build the low frequency Activated Carbon Diaphragmatic Absorber. Diffusion is really as good and effective as I'd read.


@Hilde45 - My QRD17 plans were purchased from Acoustic Fields, and I really want to try their absorber I mentioned above, based upon the excellent results my wife and I are hearing.

The sound has becoming fuller and richer from the diffusion, clearer and more refined spacial information as well, compared to just heavy absorption on the front wall.

Wow!  Those really are alien.

@celtic66
Are you meaning the skyline diffusers?
Do yours look somewhat like a scanner barcode? I think they do look modern and clean / sharp. What do you think of their effect on your system's sound?