BEST LOW VOLUME FULL RANGE SPEAKERS?

The good bass into the 20Hz range, small size and no sub woofer really limits your options. I second the above mention of the Verity and Egglestons, but would add the Gallo Reference 3. If you were willing to accept bass down to only 35Hz you would greatly increase the number of possible choices.

Of the three pairs of speakers currently in my living room, both the Thiels and the Green Mountain Europas do a good job at low volume (the Europas are best). The Harbeths--not good. FWIW, both the Thiels and the Europas sport first-order crossovers.

Wait...stop right here...isn't it a violation of some audiophile code of ethics somewhere to listen at "low" volumes?? How do you stay awake??
However, when I do listen at lower volumes and it's time for a nap, my custom Fostex with ribbon tweeter and my REL Stentor perform just fine (w/Korneff 45 amps).

Carolina Audio (carolinaaudio.com) JSM and if your lucky enough to have Ronny find a pair of Jordan 7" metal driver's for a transmission line sub.
There is more to bass then just volume. There is so much detail that is simply missing in most speakers.
I have had a few Fried transmission line subs, some with
Fried drivers, some with Peerless drivers.
While either one would play a little louder then the Jordan's, none of them can match the detail, the jump factor, the aliveness.
Not even my old MG III's or Apogee Caliper's could reproduce bass like those Jordan's.
Until you have heard what most audiophile's have been missing you and most here couldn't understand. Music from Paul McCartney, Pink Floyd, etc really show off what most audiophiles really miss.
So yes. Good (proper) bass can be had without the need
for LOUD speakers.
No! Not that crap that passes for bass now a days.
You know the garbage that comes out of most car systems
and HTIAB. That's not bass. That's boom boom crap.

GTF

I think you may have a problem with bass overload in a room of only 210 sq ft. with speakers that can go down to the 20Hz range. Also, they'll have to be pulled out from the walls a good bit to sound decent. In your case, I think monitors and a sub would work out better. With the sub, you can tailor the bass response to the room better than full-range speakers will let you. Otherwise, try speakers with a 40Hz lower limit.