OK here's another crack at it. Go to post "InDIYana 2018 dates are official" on this list, and see post 194--there are others but that was the first I came to. This was a speaker actually built by Harry Olson, 15" coax, in a donut shaped enclosure. It sounded remarkably good I thought.
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Originally posted by skatz View PostPE seems to have solved the problem posting photos. This is the Harry Olson enclosure I mentioned in an earlier post, a 15" coaxial in a donut enclosure, which should eliminate most edge refractions.R = h/(2*pi*m*c) and don't you forget it! || Periodic Table as redrawn by Marshall Freerks and Ignatius Schumacher || King Crimson Radio
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Can't you see it's a bagel, not a doughtnut!?
How about some cream-cheese?
Wolf"Wolf, you shall now be known as "King of the Zip ties." -Pete00t
"Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
"He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
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I'm not sure if it was Olson, or one of the other pioneers, but someone published diffraction data on different enclosure shapes. The sphere was the least diffractive; this would approach that.
Harder to see in the photo, but the surface of the 15" cone was studded with pyramidal shaped projections; I'm sure that would mess up the diffraction from the tweeter considerably. I am not sure what the function of those was supposed to be.
Never claimed it to be a panacea, just of historical interest.
Steve
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