Best Speaker for a reflective room ?

Despite years of really trying anything by Klipsch make my ears bleed, never, ever, put them in a 'bright' room unless you are already deaf above 12 Khz. Interestingly in one of my "bright rooms" omni directional speakers sounded the best, Ohm Walsh, Sonab OA 14's, and similar.  However neither worked well in my primary listening room. I even tried DSP, still no joy with Klipsch. Try even simple room treatment, bean bags, large soft chair, great for listening as well, curtains, artwork without glass, wall hangings, if you can leave the door open, try anything, if it's a bedroom, fill the wardrobe with closed and open the doors, you may just get a surprise.

It’s a rather large room.  Perhaps you can have a relatively near field system using omnis planted near the center of the room.  

Stiffle finish painting on walls. Furnishings, paintings on walls with or without absorption foam hinden. False ceiling there are many options. An acoustic consultant or your reasearch will open many vistas.

I agree with kota1. Black Ice audio preamp and choose a speaker with attributes you like. Call and ask for Jerred at Black Ice audio. Great company to deal with.

@peter_s I agree.  With such a large room, try to arrange some furniture so that you have a smaller listening area where you sit closer to the speakers and have an open space behind your listening position.