Alan Shaw would probably bristle at the OP describing his Harbeth speakers as euphonic - he’s aiming for naturalness and low coloration.
Harbeth speakers certainly have smooth even response and tend to have some warmth in the lower mids/bass - The broad mids sound pretty true though. I owned 3 different models. Ultimately I sought more dynamics and liveliness. I recall one (Harbeth) retailer describing them as "sleepy".