Processing corrected at discrete seats also improves sound between and around those seats.

Evidence

The modal control in any of these methods is achieved only on sound reproduced through the engineered system, but that is the objective. The fact that the processing delivers good sound to several locations in the room means that the sound field between and around those locations tends also to be improved. One can play a loop of kick drum and bass guitar and walk around the chosen seating area with little variation in bass timbre or tightness. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1626