Speaker for 11x12 room

@jeffreyw  +1

Your electronic gears on the piano with vibration control.

KEF LS50 Meta  on each side of the piano ( color matchs the piano )

In the futur , KEF KC62  subwoofer

From Stereophile measurements…

My estimate of the LS50 Meta's voltage sensitivity was 84.5dB(B)/2.83V/m…The Meta remains closer to 4 ohms for longer in the midrange but has a considerably higher magnitude in the crossover region. The new speaker's electrical phase angle (fig.1, dashed trace) is occasionally high, and I used the formula in a 1994 JAES paper to calculate the "equivalent peak dissipation resistance" (EPDR, footnote 1). The LS50 Meta has minimum EPDRs of 1.66 ohms between 135Hz and 140Hz and 1.7 ohms between 660Hz and 725Hz, both regions where music can have high energy. The partnering amplifier needs to be comfortable driving 4 ohms.

Bottom line, the LS50 Metas are not a tube-friendly speaker.

If your piano is black anf if @soix  agree ( tubes )

Fyne F502  2500$ USD

Guys the piano would be behind me close to the rear wall . 
the speaker would be near the glass door and I would put thick curtain. So basically my back is facing the piano. 
that was my initial idea at least. Or you think I should be pity the speakers on the 2.6m wall and I should sit with my back to the glass door??

im not going to buy new speakers, only used so I can max out my money on better speaker.

any suggestions regarding the speaker placement/ room treatment is more than welcome!!!

 Big glass door may produce a lot of high frequency reflections

The  speakers would be better placed , imo , on the 2.6m wall.    
Diffusion panels on that wall .

That also depends on the kind of piano  : upright piano or grand piano ?

What about a swivel chair .  You could see all around .