19-5 Interference of sound waves Fig19-6 shows two loudspeakers Fg196 driven from a common source At point p the pressure variation due only to speaker sIis AP and that due to s alone is ap. The source total pressure disturbance at point P is△P=△P+△P2 The type of interference that occurs at point P depends on the phase difference between the wavesFig19-6 shows two loudspeakers driven from a common source. At point P the pressure variation due only to speaker is and that due to alone is . The total pressure disturbance at point P is . source P 1 r 1 s 2 s 2 r P2 P1 P = P1 + P2 1 s 2 s Fig 19-6 19-5 Interference of sound waves The type of interference that occurs at point P depends on the phase difference between the waves