Where was the best reproduced sound you ever heard?

I was at the CES at McCormicks Place in Chicago in 1989.  The audio expo was in the hotel across the street.  In one of the large ballrooms they had four large electrostatic panels set up, I believe they were MartinLogan panels.  They were four large curved rectangles.  In the middle were four ARC Tube amps powering the four panels.  Behind that was a turntable and an ARC preamp.  They were playing an orchestral piece.  As I stood there I could hear each and every instrument in the orchestra laid out in front of me as if I were the conductor standing in front of the actual orchestra- 1 for 1 in size.  One of those moments I won't forget.