Audiogon member suggestions for a speaker that sounds good at low volume!!!

I am looking for speaker suggestions (new or used) in the $1000-$4000 range that sound good at low volume (45-50db).  I listen to mostly jazz and classical music late at night while everyone else is sleeping so the volume is low.  My current speakers are Vandy 2CE sigs and they sound good at higher volume levels but I listen most critically, at low volume and hope to do better.  My amp is a Classe CT-2300 with a Classe CP-800 preamp. I have a larger room 20ft X 20ft but seldom listen to music loud. Monitor of floor standing is fine.  

I understand the limitation of human hearing (Fletcher-Munson Curve) and also an appreciation of the synergy of speaker design, speaker placement and room effects.  Anyone out there have a speaker they like at low volume?

Thank you in advance.