The best speaker you ever heard?

Wow, so many speakers, so little time. I heard thousands and owned hundreds so it is difficult to compare them all as the room, setup, components, and source material were all different. Add to that I have changed in my listening tastes and even hearing changes as you age. Having said that, right now I have a pair of Dunlavy C-IVs that sound incredible as well as a pair of little known Digital Phase AP-4s which might be even better. A friend came over today and we A/B'd them for a bit and both felt te AP-4s were a bit more accurate and dynamic. The SC-IVs though have a certain musical quality in the sweet spot that is very seductive just 'right'. Longer term listenng to both will definately be required as space constraints dictate I only keep one. I have to concede though; the journey can be as enjoyable as the destination at times...

wilson audio maxx 2 and marten design coltrane

The MBL 101, the Hansen king, amgico II as mini monitors...

Beveridge 2SW2 (coherency), Hill Plasmatronics (holographic imaging), Rogers LS3/5a - 15 ohm variety (my first foray, mid-late 70's, into high-end), mbl 101E (great system synergy in all mbl reference rig) and Bev Model III's (my current transducer).

In 1971 - 2-pairs of KLH9s, JanZen ESLs for center channel and ambience plus 2 K-horns used as subs. The K-horns had a high cutoff of 100 Hz and 40db of boost at 10Hz--I'm not making any of this up. Most will say that K-horns don't give any support below 40Hz--they might lose coupling with the room and they might lose efficiency but they will load the cone all the way down. In this case, the K-horns were transformed from a, say, 80% efficient speaker into a 0.1%, or so, efficent speaker. The effect was terrifying. Source was an Ampex 350 and 15ips dubs from the original masters.
The only thing even close were Tannoy Autograph Pros (dual 15" dc)