Room acoustics dominate perceived bass response below roughly 250 Hz

Evidence

At low frequencies the anechoic data cease to reflect accurately what is heard in the listening room—it will be less smooth and significantly higher in amplitude in the room, and this portion of the curves is shaded. As the tests were done using positional substitution, the contribution of the room to the sound would be quite constant. (d) shows the average error between predicted in-room (PIR) response (from anechoic data) and real steady-state in-room measurements (from Olive, 2004b, figure 11.7). The room dominates what is heard below about 250 Hz. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1220