I have heard the Meyer bluehorn. It's a bit of a shame that most audiophiles will never hear some of these pro audio gems...because, I suppose, it didn’t have the gloss finish for the cabinets, in spite of all the engineering that goes into it.
I currently have some tad 'influenced' horns.. Pioneer'sXY series (not that cheap) in my lake cabin...with modest electronics tied to it most times. It easily puts most things I heard at axpona this year to shame...if one doesn’t mind the lack of that glossy cabinet finish, that is..
When Levinson takes a pa speaker, i.e., from that ethos, puts a nice finish on it and sets the price at 200k, it stays backordered with audiophiles running after it.
Look for a pair of used Meyer Sound X-10’s. They’re active speakers and are about the best that can be had in the 15" woofer/midrange + horn/waveguide class of speakers out there. That’s including the JBL M2, K2 S9900, Everest’s etc., and yes, you’ll have to take my word for it. They don’t sound like horns but deliver a big, effortless, delicate and coherent presentation. Great tonality as well. There’s a "domesticized" tower version in veneer, but I’d seek out the regular