excited by the in class experiments you put two speakers in your living room 80cm apart producing a sound of 750Hz. 4.0 m away you place a microphone right on the centerline between the speakers. Will the microphone detect a loud sound or a soft on at this point (relatively to the space around)?

Answer 1

If it is exactly the same distance from each speaker then there is no difference in path length between the two paths and the signals superimpose to give a maximum.