I’m sure I’ve been at a show where there were some but I can’t recall hearing them. For a while Yamamura was in cahoots with some minor nobility (member of the Churchill family) and was trading out of Wardour Castle in Wiltshire and I think they were making & selling a version of these speakers from there.
I was contacted by someone 3 or 4 years ago who was trying to write a biography of Yamamura & seek out some of his more ‘out there’ creations. I was also sent pictures by Peter from Deco of some bits that a Be customer was chopping into the shop. A mad looking unipivot arm with ceramic tube, a Melco a-like heavyweight turntable he’d made and some fairly extreme speaker components. I may still have the pics somewhere. I’ll have a look. Yamamura turned up at Munich in 2016 if memory serves with some very large horns on static display using the larger Ale compression drivers.
It’s airways struck me as odd to have the thin part of the horn going through the wider part - surely an offset or very slight twist would make building and machining so much easier! Was it for structural integrity, or sound, do we think?