The best speaker you ever heard?

Von Schweikert VR-4 MkII with the 5 mod from the factory. Clean sound, articulate, spatially accurate, intimately satisfying on small groups or solo. Sounds live like real music does. Real music like an orchestra the sound is a bit jumbled, separation in real life is an artifact. That's what I hear when I listen to VS VR-4II with the 5 mod.

I have had Vandersteen 3asigs, 5 sigs, Usher, big Fried transmission lines called the Super Monitor. Electrostatics ML Source, Acoustat Mod 3s. Would not trade any of them for what I have now.

Atmasphere, thanks for your informative post. I understand the logic of using the rated efficiency and impedance to determine actual efficiency, however in your comments you have not considered the phase angle and impedance dip of a speaker and how that can influence the load presented to the amplifier. The Infinity Kappa 9's for example had an amp-crushing 1 ohm dip with a severe phase angle which literally made many amps go up in smoke. Just my 2 cents.

What's the price range of your modded VR4's? Your comment on real music is dead on. I've really noticed that recently in my changing out my system this past year. The other artifact is crowd noise in a live recording. It's actually backwards of what you would hear sitting in a crowd. That said, it's what we are conditioned to hear and what we spend forever trying to 'recreate'. Maybe we are all just nuts. lol.

Far and away the best sound I ever heard was an Altec 604 that was all battered and driven by a two WE 205 tubed amp. I doubted I would ever find a second amp and so didn't buy it. What a fool I was.

But now Exemplar Audio is going to have 604 copies. I'm eager to hear them, but have quite powerful BMC M2 amps. I don't think I want to go back to SETs although I have seven NOS RCA 211s and two NOS GE 211s.

I can see what you guys all hear in SET gear, but I couldn't live with a main system of SET gear. That's my ear. I am pleased to hear that Audio Connections room at the NYC show in Brooklyn has been talked about as the best sound at the show. They had the Vandy 7's, AR pre amp, Basis tt, Lyra cart, Richards new amps and all top of the line AQ cables.
I have the Vandy Treo's, Basis tt with Benz cart on a Gingko iso custom table Vu built for me, with Ayre electronics and upper line AQ balanced cabling and an 8' run of AQ Castle Rock bi wired. with Heed Quasar phono. John set it all up and it takes a back seat to very few systems. Again, it's all about what else is with your speakers. Systems built for your specific room is important. I've still yet to hear anything close to the Vandy 7's. I've been able to hear most of the speakers in this thread and some are awesome and would make me very happy, but at each price range, I like the Vandy speakers best. The other top speakers I've liked have also been first order covers and time coherent. No smearing that I hear on most other speakers out there regardless of cost.