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In Reply to: RE: Dowel Rod Diffusers posted by emailtim on June 11, 2018 at 12:09:00
Look up Argent Room Lenses here in the archives and on Jon Risch's old website as to how to DIY them. You'll find plenty of information about the commercial and DIY varieties. I made them 20 years ago and loved the way they could "shape" the sound profile, though my wife hated them in the room!
Follow Ups:
I have seen those before. They are not the same as these dowel diffusers that I am inquiring about.The dowel diffusers are @ 3 levels deep versus 1 level. The Room Lenses have 3 same-sized pipes versus @ 20 dowels of various sizes.
The Room Lenses are helmholtz resonators, the dowel diffusers are not.
Also FWIW, it appears the links to Jon's DIY pages are no longer functional.
Edits: 06/11/18 06/11/18 06/11/18
Just Google Jon Risch.
All his stuff pops right up.
The original room lenses are configured as you describe, but don't work the way you think they do. However, many people have experimented with variations on the theme, including versions that were not hollow, with items such as pool noodles, dowels, etc., and in varying configurations.
If you read the old posts, and read what Jon Risch posited, the original room lenses were primarily diffusors and diffractors, barely resonators and bass absorbers.
Yes, Shatkis appear to work similarly, as might a wide variety of different devices, including louvred diffusors, etc.
Red some of David Aiken's posts for some other configurations.
You just have to learn more and experiment, and fortunately, if you're even moderately handy, you can DIY all kinds to practice with cheaply.
"... If you read the old posts, and read what Jon Risch posited, the original room lenses were primarily diffusors and diffractors, barely resonators and bass absorbers. .."FWIW, I have read all of those posts.
I am going to build diffusers for my front wall behind my magnepans, but am trying to decide on which ones to build (conventional 1D finned QRDs, leanfuser, depot-difusser, dowel rods, etc).
I built a small depot-diffuser as a fireplace cover, but want to build 2 more "full height" diffusers to flank each side of the fireplace at the 1st reflection points (where the tan broadband traps are in the pict).
Edits: 06/14/18
David Aiken experimented with different spacial configurations of same sized PVC pipes, such as quadratics, and seemed to like the effects.
When I researched these many years ago I found that someone had used pool noodles, pipe insulators, pipes, cardboard tubes, etc. in different sizes and configurations in the same arrays.
As I recall from the Master Handbook of Acoustics, there are many other ways to accomplish the same result.
There is probably NO perfect arrangement, much less one that fits all needs. Whatever you try is likely to lead to more experiments until you settle on one you like best. I know of no other way to get to that point.
FWIW, I found JR's take on the original Argents, only two arrays in my case, as perfectly good to get the benefits. Some folks found more the merrier, but I never needed to go that far. WAF sucks, unfortunately, no matter what you do with these. YMMV.
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