I'm pretty sure that cork absorbs way more than it diffuses.
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Yep- certainly wouldn't be a typical material for diffusion. It has a wavy
design, so not totally flat. But still a bath mat, so pretty flat. There are interview/videos on Peter Breunninger's AV showrooms website. He interviews a few guys with nice home setups. One of the guys has these very neat wooden diffusers on his wall. I believe they are custom designed. Sorry I couldn't send a link.