Best Speaker for 300B

Generally speaking, extra sensitive speakers (92+ db): horn-loaded (see above), passive crossover-less (Triangle et alia). You may also consider performant satellite speaker/active sub combos (A-Physics Step, et alia). There are many offerings; matching the sound to your tastes, however, is what ultimately counts.

Further info regarding your musical tastes would help in giving more specific suggestions.

Demo & enjoy!

D-K, aren't your Reynauds a minimal cross-over design? I seem to remember Reynaud producing some models (yrs ago) without a standard cross-over... I don't remember the model, but these speakers were being driven by the Audions.
BTW, I also remember the Audions producing fine tunes driving a pair of Lowther-loaded speakers. Great machines!

Indeed, D-K, the Silver Nights I auditioned driving the Lowthers were wearing WE 300b's. What impressed me the most was the transient attack -- on classical, mind you ("Pictures at an Exhibition" (Giulini), I still remember)!
Anyway, this was at a Hi-end show, and Mr Reynaud was lecturing about the minimal effect of his crossovers on current supplied to his speaker units... hence my question.

Cheers!