The best speaker you ever heard?

Without doubt, a properly positioned pair of Avantgarde Duo's through all BAT upstream electronics. Largely because of their speed, the Duo's reproduce music that seems to just appear in space, as if out of thin air.
They are just breathtaking!

ACI Talismans. I've heard way more expensive speakers and many fine systems. But they sounded more real than any other setup I've heard. It was about a year ago and I still remember just how fine they were. Someday, I will own a pair myself!

There is no question that the Overkill Audio Ovation is the best in the world at ANY price. Between the well-documented and grounded acoustical theory behind it, the execution is phenomenal!(plus 20+ years of psycho-acoustic research by Dr. Josef Manger) The hardest part is auditioning them in the States. Try their website for more information: http://www.overkillaudio.com

Avantgarde Duo's is the best speaker I've ever heard

What is your definition of a "best" loudspeaker. How about the loudspeaker that makes you think you are listening to live music. The Cain & Cain single horns or the Zingali Overture 4's or the Wilson Benesch Curves. To name a few. Unless you have spent over $15000 you better say that you have a tube amplifier. I haven't heard any solid state amps that sound like live music. How come all those really good microphones are tubed?