Anyone else here interested in, or built, or even heard Folded Well Diffusers??

Nope, time is too precious.

Dennis quoted me 3,000 to 4,000 for his carbon technology, says it's the only thing guaranteed to work and I need a lot for my small room. 

@brunomarcs - I haven’t actually heard the carbon technology of Acoustic Fields at all. When Dennis spoke of how he come to discover the technology by accident, it reminded me of what was told to me when I visited the Genolan Caves.

It wasn’t too much of a leap to believe what he was saying about the micro pores in the activated charcoal is powerful for low frequency attenuation/absorption.

My plan is to get the diffusion done, take some measurements and build (from his plans and his DIY activated carbon) some ACDA-12 M type modular bass absorbers.

I can’t speak to the carbon absorbers, I haven’t heard them as I stated, but his QRD from plans work very well. I have only two assembled of the four cut out, and I have the two in my room, we love how they look and work in my room.

I spent $2000 on cherry wood and some more on glue, that’s just materials for my four QRD17 diffusers if you need some sort of idea. There is of course a big difference in cost between cherry wood and MDF.

I wonder if he has a customer near you, that might let you hear his room, to get an idea? I’m in the middle of west Texas, guns and big trucks galore, but audiophiles are not common out here. So I just went for it, so far I’m happy with the results.