BEST LOW VOLUME FULL RANGE SPEAKERS?

Shahinian Hawks or Diapasons would fit the bill. Mine pass the WAF factor for our earth tone living room. They wouldn't work in a glossy modern room. For the money, they are probably the best speaker for classical music available.

Anarchy
I am happy to see that the caps don't seam to bother you today.Sorry for the rest of you guys,he knows what I am talking about,once I posted in caps(no big deal,in my opinion)and he jumbed in from nowhere to flame me,that was rude.
GEORGE

Audio Physic Virgo IIs. Very detailed at low volume, bass is a bit rich, which will help a bit with loudness at low volumes. Also, consider speakers with rearward firing woofers, like Linn Espek or Verity Audio. By varying the distance from the wall, you can significntly vary the amount of bass, and therefore, the amount of loudness.

Or you can get a Behringer DEQ24/96 for $400 and dial up your own loudness equalization curves. This is a VERY transparent piece of equipment.

Or a receiver with a loudness button, but if you're willing to spend 5 figures, this is prob'ly not going to do it for you.

In case you don't understand what we're getting at, it's the fact that the human ear is non-linear, and at low volumes is not as ensitive to high and low frequencies as at normal or concert volumes. Therefore, if you want to enjoy music at low volume, the system should be a bit bass and treble heavy at high volumes.

You are also right in seeking out something with excellent detail retrieval

A cool bedroom system could be a Mcintosh Integrated and second hand Watt-Puppy6s

I am in a similar situation and listen to the same types of music. My roon is a little larger, but I listen to music late at night after everyone goes to sleep. Every once and a while on the weekends I get a chance to listen a higher volume--which is fun! I went through a number of speakers and finially landed on a pair of Verity Audio Fidelio's. I find them to be so true to the music--these speakers will pull you in and make you feel like you are sitting about ten rows back. The soundstage is very deep and layered and the detail at low volume to my ears is exceptional. There are speakers that will make you think you are sitting in the first row, but to my ears they sound a little compressed. The rest of my system is a Cary V-12R with the oil cap upgrade and an Audio Aero Capitol mk2 CDP.Hope this helps, it is just one persons opinion, and there are sure to be many. Let your ears make the finial call!