The best speaker you ever heard?

No single winner

Infinity IRS Beta driver by Carver Tube amps, I forget the name of the amp, with a turntable for the front end. I don't remember the entire setup, but I think the preamp was a Counterpoint & there was a solid state amp on the bass towers. I heard it in Lyric HiFi several years ago,

Also, Martin Logan CLS w. Eminent Technology Bass Towers. Great sound. I heard this several years ago. ARC tube amps on the Martin Logan

Cello speakers w. Cello amps - uncanny dynamics.

My Nautilus 801s playing loud with Rock.

Avalon Ascent or Eidolons playing at medium volumes.

I am still looking for a great speaker which can do it all. What I found is that intimacy & the ability to play loud are mostly mutually exclusive.

I have to join the Avantgarde Duos with SET (300B) monoblock amplification. I always think other systems are lacking by comparison after living with the Duos for a couple years.

What I have now off course.

Usher 738:form me the best sound for the price.

Fantastic medio low frequency managemente.

Spatiality too and dynamic.
Ciao

Sound Lab A-1 delivers music better than any product I've heard. They are huge and power hungry, but if you can make that work, they are simply stunning.

without a doubt the Cabasse Atlantic's are the best I have ever heard