Revel Loud Speakers have always had some fashion of tuning in their high end speakers. It's more trim controls to compensate for near wall boundary gain, and/or highly reflective surfaces. They're $22k for a pair, but it shows that some manufacturers will allow the sound of their speakers to be altered to compensate for placement/room issues.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris