I like certain higher efficiency horn systems for very good low level clarity and "jump" (dynamics). But, one has to like horn sound to begin with or find the relatively few such systems that don't have as much of horn coloration or assemble a system from parts.
For more conventional systems I think you should look at something like the Reference 3A (someone mentioned it above), perhaps a classic box-type Spendor (not their floorstanding speakers) or Audionote speakers.
Electrostatic speakers, such as Quads, sound really good at low volume because of their clarity and their speed (good at small dynamic changes). They also have the advantage of being dipole speakers. With dipoles, there is a back wave that is in opposite phase to the front wave. The two waves tend to cancel out at the sides and significantly less energy is put out into the room outside of where the speakers are aimed. When I changed from electrostatic speakers to my current dynamic system (horn midrange, cone woofer, bullet-type tweeter) I was surprised at how much louder was the leakage into other rooms. Magnepans (planar magnetic) are also dipoles, but, they tend to need to be played a little bit louder before the music starts to "jump" so I don't know if they would work for you (but otherwise, they are terrific sounding and not too expensive).
For more conventional systems I think you should look at something like the Reference 3A (someone mentioned it above), perhaps a classic box-type Spendor (not their floorstanding speakers) or Audionote speakers.
Electrostatic speakers, such as Quads, sound really good at low volume because of their clarity and their speed (good at small dynamic changes). They also have the advantage of being dipole speakers. With dipoles, there is a back wave that is in opposite phase to the front wave. The two waves tend to cancel out at the sides and significantly less energy is put out into the room outside of where the speakers are aimed. When I changed from electrostatic speakers to my current dynamic system (horn midrange, cone woofer, bullet-type tweeter) I was surprised at how much louder was the leakage into other rooms. Magnepans (planar magnetic) are also dipoles, but, they tend to need to be played a little bit louder before the music starts to "jump" so I don't know if they would work for you (but otherwise, they are terrific sounding and not too expensive).