The third interaction is the position of the listener relative to the speaker.Therefore the solutions for these interactions are very closely related. Both of the above effects are the result of a summation in the acoustical space of multiple sources, either speaker and speaker, or speaker and reflection.

Here the response varies with speaker position, depending upon the relative time arrival and level between the direct sound and the sound reflecting of surrounding surfaces. The second category is the interaction of the speaker(s) with the room.This is due to the summation of the two responses arriving at a relative time (phase) and level at each listener position. Adding another speaker results in a modified frequency response at virtually all listening positions. The first is the interaction between speakers.There are three categories of interaction that will cause the frequency response to change: The interaction with the acoustic space and other loudspeakers is what causes this frequency response to change at the listener position. Most good manufacturers build their loudspeakers to have a fairly good frequency response, but the sound reaching the listener may not necessarily follow the same response curve. Most audio electronic devices have an almost perfect flat frequency response (20Hz to 20kHz), but this is not the case with electro acoustical devices, like loudspeakers and microphones. Equalizing loudspeakers in a sound system

Moi3d set flat direction sweep