I've had the opprotunity to home audition a JVC RX-EX1SL with my single driver speakers (Bob Brines FTA-2000).
http://www.geocities.com/rbrines1/I should be nearing the magic 300 hour point on the JVC soon. So far its better than my 6 year old $700 100 wpc Rotel stereo receiver, but not as good as a $1500 12 wpc Decware Torii integrated tube amp that I also recently had in for an extended in home audition. The Decware had better imaging, bass fullness, detail, and midrange magic.
Of the three, the JVC wins the sound quality per dollar contest but as expected it also, by far, has the poorest quality of construction.
By their very nature single driver speakers are very easy to drive. The transmission line design of my FTA-2000 improves on that even more by smoothing out the bass impedance curve such that the 12 wpc tube amp got plenty loud in my 1700 cubic foot room. So from a strictly numbers/electrical design viewpoint I'm not sure if I'd expect an unique synergy between single driver speakers and any particular type of amp.
While the FTA-2000 may be the ultimate single driver speaker IMO (with in room 25 - 20,000 Hz response with the right amp), I wouldn't say its the best speaker ever (no speaker is or ever will be). I've read that chip amps are a good match for single driver speakers and from a "simplier is better" design perspective they match up well. So that's what I'd like to try next, while keeping the price/build quality of the amp on par with the speakers. BTW the Decware amp fits well into those simplier/price/quality camps too.