The best speaker you ever heard?

I have heard many that in some way made a lasting impression to this day. To me these were all good and in some ways "the best".I'll give examples:

-Quad ESL 57/63
-Acoustat 2+2
-Linn Isobarik
-Apogee Diva
-Magnapan various models
-Sonusfaber Extrema
-Vandersteen 3A, 5A
-Proac Response various models
-Wilson Watt/Puppy 3
-Martin Logan Sequel 2
-Martin Logan Aerius I

And last, but not the least, and probably the most fun events ever (granted not the last word in refinement and resolution) were to hear a friend's Cerwin.-Vega DC1515's playing from his varanda onto an open field at a distance of 20m with the sum total of 1600w of Rms power from four mono amps driving them. Totally mind blowing if you can appreciate the sensation of a live rock concert in your backyard!

My favorite so far is a pair of Tannoy's Dual Concentric speakers, a DIY project. This comprises some hefty 15" DC unit, a Tannoy supertweeter and some extensive outboard filters in a huge cabinet. Sound is absoluty amazing, closest thing to a live concert I ever encounterd. One major drawback: they aren't mine.....

WHT PR1 from down under

The Living Voice Air Partner is without doubt the greatest of all the speakers that I have heard. The Living Voice Tone Scout is a good second and the Carfraehorn 'Big Horn' is also in the running possibly as third best. I would give a lot to own any of these!

Bose Acoustic Wave System series 2 !