The antithesis of the 'classic' Thiel sound, often stereotyped, never copied? I'm pulling these purely out of memory from dozens of audio shows and general familiarity, not A/B home listening! I could be wrong on any of these, corrections are welcome.
Sonus Faber, rich, romantic, not particularly 'fast.'
Harbeth, Spendor, or several British speakers (among others I'm sure) that still have the 'BBC dip' as part of their sonic design intent (a dip in the upper midrange to make them sound less-forward, more-'polite').
Magnepan or Apogees, the opposite of box speakers, with dipole radiation, narrow lateral dispersion, broad wide imaging (the antithesis of 'pinpoint'), limited bass dynamics and extension, certainly not bright. (I'm leaving out true electrostatics as so often reviewers compare Thiel's speed and coherence to them).
Horn loaded speakers starting with Klipsch, including some of the Cerwin Vegas mentioned. Huge SPLs with no danger of frying a midrange coax.
Not that any of these brands are innately 'inferior' or 'worse' than Thiels, but that their design briefs -- by choice or speaker type -- are quite different.
