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Someone on stereonet Australia has Ukkonen. A few people have heard them. Not sure if many people buy it; the Sointuva is popular though.
Most people buy these March Audio speakers and like them like them it seems. A few have compared to something equivalent. I don't recall anyone trashing the sound quality. Some may prefer wider dispersion.
I recall a couple of people saying the Ukkonen sounds better. Not much extra discussion though.
I regard the use of beryllium in speakers as irresponsible, given the immense health hazards to the workers who fabricate using the metal and the ready availability of suitable alternatives.
I have the original Sointuva (in Melbourne) and I am super pleased with it, but if/when Alan decides to do an active tower with the new Purifi tweeter, I would buy it as soon as available as that would be my end game speaker for sure.
Measurements still not added! I wonder if the design is being improved while it's being measured. That would explain the delay. I am going to buy a pair if all goes well.