Many suggestions here that tend toward brightness rather than warmth.
Spendor Classics are yet the best combination of warmth and detail I’ve heard. The midrange is completely effortless and natural with enough detail to keep you engaged and take notice of new information in familiar recordings, yet they don’t highlight the distortion of poor recordings the way a Revel or Focal often can.
The cone material used by Spendor seems to have the perfect amount of damping. Voices sound completely natural and present with zero audible ringing and resonance—an issue I believe I can detect even in Harbeth’s vaunted Radial material.
Other brands that get the midrange damping correct are Stirling Broadcast and Graham, which is likely attributable to their speakers having been designed by Spendor veteran, Derek Hughes.