I wasn’t able to visit most of the rooms mentioned, but the room that really knocked me out was Kyron Audio from Australia.
Their Kronos speakers are cone dipoles and they are powered by a large box that is an all-in-one (dac, preamp, amp).
They played music with great transparency but, somehow, not all the cues that tell you you’re listening to recorded music.
Huge soundstage, great depth and layering, great clarity, each instrument playing in it’s own space. Very natural and musical, the sound was mesmerizing.
Way too much for me to afford, of course, but I wish I could.