15k USD Speakers for Classical and Pop Extended Listening, Near setup, Low volume

Just buy the Borresen X-3's for 11K and be done with it.....You're Not going to beat these with anything under $22K...read the reviews....audition them...

Get any small well regarded speaker for nearfield listening, cover your desk with shag carpet, and lean in...you may need some back surgery eventually but it's the only way. 

If your listening at low volumes, why are you going to spend 15k? There are plenty of speakers that play well at low volume for far cheaper. And for a desk set up?? I'd be looking at no more than a 500 buck speaker. Wharfedale would be my choice....$249/pair diamond 220, or diamond 225 at a bit more, can be had for 349....on sale, if you can still find them. Both play well at low volumes, non fatiguing and good bass. 

first of all whoever said that the gold 300 G5 would overwhelm the room doesn't know what they're talking about that room is more than big enough to accommodate them I had them in a room 8 and 1/2 by 23 and they didn't overwhelm the room but I bought the platinum 200 G2 instead cuz they were better but if you really want to improve your system get the Townshend podiums they isolate vibration down to three Hertz and they'll get rid of almost all room problems The improvement is as if you bought much more expensive electronics Best upgrade you could do.

6 feet is fairly close, not enough distance perhaps for drivers on some very good speakers (Borresen, etc) to sum properly.

The Andrew Jones "concentric drivers" should work better for your placement restrictions. Get a pair of the Mofi Sourcepoint 10 or 8 and the KEF KC62 or Rythmik subwoofers to go with it.