The best speaker you ever heard?

Apogee Scintillas & Divas.
Avalon Ascent MK.2's & Eclipse Sigs.
Dahlquist DQ-20I's & DQ-30I's.
Vandersteen 3 Sigs & 5A's.
Von Schweikert DB-99, VR-7&9's.
More than one pair, sorry !

Question is very subjective.

Best speaker to A might not be for B's ear.

To me, I think the marten design coltrane should be one of the best.

A toss up between Soundlabs the Ultimate one with CAT electronics, and the Sonus Faber Stradivari with Nagra tube equipment.The rooms of the owners were different as was all associated gear but both were systems with first rate sound.It would be hard to pick a winner,so I'll call it a draw.

The Joseph Audio Pearl. I heard these at CES and thought there was a real accoustic Bass player in the room, so I went in. It was just the Pearls in there.

The Fab Audio Model 1 driven by Tom Evans Audio Design electronics (Vibe/Pulse/Linear A) are doing things I've never heard another speaker do in 25 years of audiophilia nervosa. It's hard to put into words just how real this setup sounds. Much of it is due to the amp, but the Fabs are the most transparent speaker I've ever heard and let absolutely everything through. I've not heard a planar of any description, nor indeed any other speaker setup, come close to this. It's the whole enchilada.