Searching for the most "accurate" speaker (below 15K)

@2psyop Vandersteen is a very forgiving by amazing speaker. You could save some money and get the Treo, and invest the delta in room treatment. That will most likely be a better route to go.

@ahendler I interpreted "accurate" as flat response. That was why I originally recommended the Decware HDT. That said, potentially time coherency is more important that completely flat response to the OP.

End of the day, I fine that many Hifi speakers tend to be more forgiving, and more enjoyable to listen to but they also bump up the treble quite a bit. I think many mfg. know that as age increases, the ability to hear HF decreases.

That said, I am always blown away when I listening to a pair of Treo's or Quatro's.

Focal Utopia with Nagra should be able to give you what you are looking for. Speaker cables would have to be carefully matched. Many use Utopia with tube electronics, though, it has a tendency to be a little bright.

@ahendler , that is a fair and excellent question. Perception is a very idiosyncratic matter. Las week I got a recommendation for some speakers (I will not mention the brand model). Please note that the recommendation came from a fellow audiophile who is in this hobby for some 30 years and he builds some speakers himself. I found the sound to be a total disgrace. No scale, no speed, dynamically impaired, with box colorations ... I could go on. 
By saying that I'm looking for a poor man's Magico Q series, I'm saying something about my preferences. I look for a speaker which adds or detracts as little as possible from the signal it is being fed. Nylon strings should sound like nylon and steel like steel. The speed of the attack of the notes in the piano should be the same on the right and or in the lowest notes on the left hand... I think you get the picture
The emotion is in the music. A speaker should not sound "happy" or "sad"; "warm" or "cold"; "dark" or "bright". It should be the "messenger". I think neutrality and accuracy are often mistaken with sounding "aloof". Sorry: those speakers are subtracting so much stuff from the music that they are far from accurate ...

@gdhal : the GoldenEars are very well engineered. Think about how much you are getting for the money: a large box, a DSP+Amp and 7 drivers in each speaker. And, of course, they cannot be using top of the range components. And, actually, the whole thing works quite well ... as long as you use electronics from the same league (before I had a ML 383 ... quite decent, but the Nagra is from a different galaxy). When you move forward the you realize that the drivers (and particularly the active/passive sections, although I got a big improvement from using aftermarket powercords) don't share the same speed and resolution. The soundstage grows in size but not in accuracy. The box colorations become evident ... In a nutshell: there is a too strong sonic signature coming claerly from the speaker. 

@willemj : the room is less than 20 sq meters (200 sq ft). Thanks!

@jjue and @inna : I've briefly auditionetd the Sopra 2 and was impressed. And this was with less than stellar electronics ... I'm trying to get an audition at home :)