On how they work, the only info I've seen is on Jon Risch's web page. Email me thru Member Lookup if you need that address or if you're interested in DIY clones I can tell you how to make (in detail). I use two flanking my Quad ESL 63's and recently made a 9-tube 32" long Lens to handle reflections from the right side of my room (which has heavy drapes on the left side). They not only work beautifully, but they do better than RPG-style diffusors there. Some Stereophile reviewers use as many as five Lenses in a room, and I'm now inclined to think they know what they're doing.
