The best speaker you ever heard?

Nautilus 800 and 801.
There are always trade-offs in any speakers that I listened to. Some have 99% imaging but 85% in freq range Some have 99% transparency (like logan) but lacking in dynamic, some has good low level details but sound compress when played loud.
I like the Nautilus 800 and 801 because they score 95+ across all spectrums (excellent dynamic, imaging, details, frequency range and transparent).

Avantgarde Duo's - I've heard a lot of speakers, but nothing has made me "Enjoy" listening to music like these horns with a great SET amp. Set-up is critical (heard good and bad ones), but when done right, these are absolutely magical - foot couldn't stop tapping. I can't wait to hear Trios, although I might sell my car to buy them if I heard them.

Audioprism Mantisa pre-amp
Krell Ksa-250 amp
Apogee Duetts Signatures

One of the best, if not the best. The Duetta Sig's are the best all-around speaker I have owned....they do it all!!!

I have owned many a speaker system but NONE sound as real as these do.

Dave

Well, there's always the JM Utopia Be. Perfect speaker, but who wants perfection? Perfection is cold. The best purveyor of music is the Sonus Faber Amati Homage. Oh. My. Gosh. Give me this. Anyone have a pair they want to give me for $5,000? :)

Two years ago I saw a pair of Soundlab A1's here at A'gon for a great price and bank wired the money. I hitched a ride with a friend going from Cincy to Ocala. I vacationed with my sister for 3 weeks in Jacksonville, rented a U-Haul truck to get the A1's home unblemished, and have been in bliss ever since. I hope the A1's will keep me happy for the rest of my days. Darn this addiction...I may have to consider some factory upgrades someday to satisfy my unceasing craving for perfection.