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I too got the upgrade bug, hints why I bought that center channel speaker.
I might have heard that ZU Soul MKII at RMAF but I am not sure. I have heard a lot of ZU speakers. Why stop there, just get the Definition and be done already. Only $16,000 for a base pair.
Congrats, man! I have a pair of DefHeads in my bedroom. They are hands down the best speakers I've ever heard. I don't wish for a subwoofer with them, ever.