1. The problem statement, all variables and given/known data Two speakers located 4.0 m apart. Listener is seated 25.0m from 1 speaker, and 27.0m from the other. We drive the two speakers at a freq. which we sweep from 100 to 500 Hz. If the 2 speakers are in phase, find the frequencies at which the waves constructively/destructively interfere. Speed of sound = 343 m/s 2. Relevant equations x2-x1 = n[itex]\lambda[/itex] (constructive) x2-x1 = (n+0.5)[itex]\lambda[/itex] (destructive) lamda = v/f 3. The attempt at a solution Not sure to be honest where to start since there is a range of frequencies.