The best speaker you ever heard?

The best sounds I've heard recently have come from Magico Minis, the latest and greatest large Maggies (20.?), PSB Synchrony, MBL 111s and my own OHM Walshes.

Not to say these are categorically the "best", only the best sounding I have heard recently. Much of that is likely due to proper setup and matching to room and other components.

Tonian Labs TL-Ml MKII.
The most natural sounding speaker I've ever heard.

The most impressive speaker I've heard was Isaac Asimov at Rutgers in the early seventies. I loved the Foundation Trilogy.

2008 CES- Venetian. MBL 101 powered by MBL Amps.
Incredible display of brute power. You never heard Pink Floyd like this.

Magneplaner 20.1...A very difficult and subjective question...my experience was when I was in an adjacent room when I thought there was a piano player at the keyboard....what I was hearing was a pair of Magneplaner 20.1s biamped with a pair of ARC Ref 300 and a VT100MK III. The source was an LP on a Clearaudio Turntable ?? ..can't tell you the cartridge or arm or cables....but when I thought there was an actual piano playing instead of recorded music, that was the critical mass info I needed.
The LP was a Mercury Living Presence solo pianist recording of Pictures at an Exhibition