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

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

Fyne F502  2500$ USD

 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 .