Yamamura made 3 different Dionisio. the 32 (that is aestetically littlem different and with a much littler motu, it seems like the PNOE speaker but with rectangular mouth).
Th Dionisio 27 with normal mouth (about 1.30 x 1.40 metter and horn long about 5.2 meters) and the Dioniso 27 with larger mouth (about 1.8 x 1.18 mt and horn of 5.5 meters long).
The numbers 32, 27 represent the lower frequency the speaker is able to reproduce (theoretically th 27 large mouth should be called 25).
Where have you listened the Dionisio?
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It was many years ago in London, I think that it was in their showroom in the Castle but memory fails me and could have been at some audio show. I mostly remember how impressive they looked. I heard various Yamamura systems at different times, there were some infinite baffle speakers using the same full range driver at some point too which really didn't work all that well. I never really connected with his systems, they were always at some stage of development but never quite there when I heard them.
david