From: Brendan Minish <bminish@o...>
Date: Fri Jan 28, 2000 1:47 am
Subject: Re: 2-D QRD Diffusors
At 18:39 27/01/00 -0500, you wrote:
>How are you going to build them?
Probably out of MDF and thin (0.5mm thick) steel but I am open to
suggestions, I am going to do some experimenting with High Density foam
Insulation as well.
>Something like an array if these babies?
I hadn't seen this particular design until now, the Only design I was aware
of was the RPG Systems Ommnifusor type see.
>Tell us more.
I will when I work it out! I was hoping that someone Else here Would be
able to tell me more, Most of what I know about them comes from an AES (
) Preprint (2938) called 'The QRD Diffractal: A new 1
or 2 dimensional Fractal Sound Diffuser.' By Peter D'Antonio and John
Konnert of RPG systems limited.
I am not an AES Member but anyone can order re-prints of papers etc from
them, It's a very good resource for all sorts of audio related Information.
The devices talked about in the paper involve building High frequency
diffusion inside low frequency diffusion (Hence the reference to Fractals)
I haven't really got room for the low frequency diffusion (requires too
great a well depth) so I'll settle for good diffusion above 400 Hz or so
(Which should give me some diffusion down to 250Hz or so.
I May add some lower frequency diffusion to the ceiling if I need to.
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