sticking only with the speakers i myself owned, i'd say Wilson Watt Puppy 2/3's, 5.1's and 6.0's i owned from 1995-2001. big sound, but spot lit and not flowing. tough load for an amp. don't get me wrong i enjoyed them immensely until i got bored with them and the Mark Levinson amplification. my musical tastes were evolving, and i wanted more than i was getting. not more of that sound, but more musicality.
i could substitute any speaker/amp combination my dealer had on hand at the time.....in 1995-2001.
when i switched to the Kharma Exquisite 1D's in 2001 it was a much more coherent and balanced presentation and an easier load that my Tenor 75 watt OTL's loved until they exploded. that sound is still my reference sound to this day. not the explosion part.