Speaker recommendations 10 to 30k and no beryllium

@gadios.  

+1

 speakers and amps are some of the best in the industry!!!!

 Roger Sanders sound systems.  He is one of the inventors of the panel speakers.  
Or the one to make them worthy!
his Magtech amplifier are the ones to actually drive those MBL Radiostrahler monsters.

Try one of EgglestonWorks speakers - New or used.  I have the Rosa. Bought it used.  Amazing for a room about the same size as yours.

Joseph Audio Perspective2 Graphene. Amazing speakers, amazing. 

Revel Salon 2 or Studio 2, Usher x-tower or BE-10 or BE-20

PAP Trio’s, will need less room treatments than a box, wall of sound, high efficiency. Lots to like.
 Best. Dave H