Seats placed on room-mode null lines increase seat-to-seat bass variation.

Evidence

Placing listeners at the null lines of firstor second-order room modes (1,0,0, 2,0,0, 0,1,0, 0,2,0) is to be avoided if possible, since it will tend to result in larger seat-to-seat variations. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1575