Quality sound at lower volume requires good, effortless bass response. The ability to produce impact and overcome the ear's bass sensitivity deficit.
This often has more to do with the quality, power and robustness of the amplifier with respect to speaker sensitivity.
All else being equal the amplifier is more of a factor for quality low volume bass response than the speaker.
One example were a set of PSB tower speakers I owned.
Driven by an 80 WPC NAD amplifier the sound quality and bass at lower volume was OK but not impressive.
I upgraded to a 150 WPC NAD amplifier and the low volume bass impact was precise and effortless and the sound was fantastic- so much better than with the prior amplifier.
This often has more to do with the quality, power and robustness of the amplifier with respect to speaker sensitivity.
All else being equal the amplifier is more of a factor for quality low volume bass response than the speaker.
One example were a set of PSB tower speakers I owned.
Driven by an 80 WPC NAD amplifier the sound quality and bass at lower volume was OK but not impressive.
I upgraded to a 150 WPC NAD amplifier and the low volume bass impact was precise and effortless and the sound was fantastic- so much better than with the prior amplifier.