What speaker properties (sensitivity, impedance, frequency response, etc...) have a significant impact on the quality of the sound at low volumes?
I understand that sound quality is subjective, but I hope to find at least some pointers on what specifications play a role in the quality of the sound at low volumes.
When googling around I find plenty of (audiophile) forum threads where people recommend specific speaker sets for low volume listening, but do not mention what characteristic makes those speakers perform well. Additionally people recommend headphones, but those provide a different listening experience altogether and I don't see them as a drop in replacement to speakers.