I'll second the Electrostatic route........

My ML's  have a sound stage that starts several feet outside the speakers and across the fifteen feet between them..... I sit about 8feet back on axis. Speakers are about 3/4m from rear and side wall, [toed in by about 30 degrees].

this has caused problems ....on cd has a door bell the same as mine which comes in at the far right [near my front door] with the effect that I go to answer the door with no one there.