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AUDIO FORUMS >> Room Treatment >> New Diffuser Design
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Message started by Steve Deckert on 04/07/17 at 19:26:52

Title: New Diffuser Design
Post by Steve Deckert on 04/07/17 at 19:26:52

Was going through some old pictures and found a diffuser design that I never got to complete past the first prototype.

I have decided to post them here where they might inspire someone. While these are calculated for small cardboard tubes, it could easily be scaled up for larger tubes.

In this design each well has it's own divider vain (the walls of the tube) and instead of setting the face flush and creating varied well depths I choose to make each tube the actual length and flip it upside-down for simplicity.

On scaled versions with say 1.5 inch ~ 2.0 inch tubes I would likely experiment with fiber-fill in the tubes.

So, that's your seed... let me know if anything grows!

-Steve

Title: Re: New Diffuser Design
Post by Steve Deckert on 04/07/17 at 19:27:10

Title: Re: New Diffuser Design
Post by Steve Deckert on 04/07/17 at 19:27:25

Title: Re: New Diffuser Design
Post by Steve Deckert on 04/07/17 at 19:28:21

Title: Re: New Diffuser Design
Post by Steve Deckert on 04/07/17 at 19:28:57

Title: Re: New Diffuser Design
Post by Steve Deckert on 04/07/17 at 19:29:20

Title: Re: New Diffuser Design
Post by Steve Deckert on 04/07/17 at 19:29:51

You can see in this rendering where I put the light straight on that even the light is diffused as a perfect hemisphere. I'm sure it will treat high frequencies the same way.

Title: Re: New Diffuser Design
Post by Steve Deckert on 04/07/17 at 19:32:34

Title: Re: New Diffuser Design
Post by Lonely Raven on 04/19/17 at 17:29:29

I remember us talking about those - in fact, just last year I was already revisiting that idea, and shopping for 2" PVC square tube. I know they make it, but nobody makes it inexpensively. I can actually get steel square tube for less!!

Maybe I'll try the round tube, though I feel there will be a a bunch more absorption due to the round shape of the diffusers, they should however diffuse quite well.

Title: Re: New Diffuser Design
Post by Steve Deckert on 04/21/17 at 02:45:04

Yes, the round will diffuse/diffract far better. I am willing to bet the near field performance is superior to a standard vertical diffuser. A regular diffuser really doesn't develop an in tact hemi-disc until you get about 10 feet away from it. Most listening rooms are not 20 feet wide. The absorption would be ideal for most rooms which desperately need it, yours not included of course.

If you make one from cardboard tubes it will sound far better.

Title: Re: New Diffuser Design
Post by roggae on 04/27/17 at 20:59:14

i'm happy to demo these in my basement if someone wants to build one!

Title: Re: New Diffuser Design
Post by Donnie on 04/27/17 at 23:54:18

Here is the paper tubing at a pretty good price.
http://www.pyrodirect.com/Item/065-0035-b25

Title: Re: New Diffuser Design
Post by Lonely Raven on 05/03/17 at 15:29:55

If they were a bit longer, and they'd need to be 1" ID. That's a great find to experiment with some wall art though.

Title: Re: New Diffuser Design
Post by Lonely Raven on 05/03/17 at 15:40:11

Woah, check out what I found!!

http://www.ebay.com/itm/Lot-of-12-SQUARE-clean-Cardboard-Tubes-thick-walled-for-Art-Craft-Church-/222491948424?hash=item33cd8db588:g:lfUAAOSw~y9ZA7lr

Now if I can just find a larger bulk of them. I can work with square cardboard tubes!

Title: Re: New Diffuser Design
Post by Lonely Raven on 05/03/17 at 16:44:57

Well, the square tubes are a bust. I can't find them in any quantity at a decent price.

I'm casually running the numbers on round tube to see what I can do with $100 in materials.

Title: Re: New Diffuser Design
Post by Lonely Raven on 05/12/17 at 19:10:30

Found this on Gear Slutz.

https://www.gearslutz.com/board/bass-traps-acoustic-panels-foam-etc/600977-pvc-pipe-diffuser.html

Title: Re: New Diffuser Design
Post by Lonely Raven on 05/12/17 at 19:13:09

Title: Re: New Diffuser Design
Post by Donnie on 05/12/17 at 23:16:36

PVC pipe is expensive, unless you knew a plumber who would give you his extra ends. Or if there was a decent size construction site with lax security....