A factor too few speaker manufacturers take into account, in my opinion. Many of us live very close to neighbours, with thin walls and want to be "neighbourly".
I agree that high sensitivity is often a prerequisite and can name a number of higher sensitivity speakers that sound good at low volume, Harbeth, Devore Fidelity, Living Voice and my own Daedalus. I can also think of well known brands that need the wick turning up, to sound their best, particularly Focal and B and W, neither of which I can say I really enjoy.
I agree that high sensitivity is often a prerequisite and can name a number of higher sensitivity speakers that sound good at low volume, Harbeth, Devore Fidelity, Living Voice and my own Daedalus. I can also think of well known brands that need the wick turning up, to sound their best, particularly Focal and B and W, neither of which I can say I really enjoy.