My 2 cents-
Either LA or NYC.
If choosing the latter, then, by all means, check out Audioconnection in Verona, NJ.
Manhattan has quite a few dealers, but John Rutan is the worth visiting.
Bob
Best USA city to audition a system.
I one is willing and able to spend five (six?) figures on an audio system, an in person audition is obviously desirable. What US city has the strongest lineup of audio dealers that can provide a live audition? I’m guessing LA, Chicago, NY, but it is only a guess. I can tell you with certainty that it is not in Louisiana.