OMA Gaussian Diffusor.

OMA writes: "Not all rooms sound great; we can help you create exactly the kind of listening space you want, no matter what size. Our team of world class acousticians and audio engineers have worked on just about everything: custom installations, home theaters, listening bars and lounges, private clubs and even large concert halls and recording studios. We even design and build several lines of acoustic treatments that can be tailored to your room, interior decor and listening preferences."

"Because OMA (and also Fleetwood Sound Co. @fleetwoodsound) create horn loaded loudspeakers with highly controlled directivity (a good thing) the way our speakers work is different from conventional or other horns speakers, and our approach to acoustic design is also unique. Let OMA help you achieve the best possible sound.

The Gaussian Diffusor (pictured here) can be used on room boundaries or free standing, and operates lower in frequency than our 1D Diffusor. More info on our acoustic treatments can be found on our website."