For any two wave sources, this Tactics Box sums up how to determine whether the interference at a point is constructive or destructive. wo identical loudspeakers, speaker $1$ and speaker $2,$ are $2\mathrm{.}0$ mm apart and are emitting $1700-$HzHz sound waves into a room where the speed of sound is $340$ m$/$sm$/$s$.$ Consider a point $4\mathrm{.}0$ mm in front of speaker $1,$ which lies along a line from speaker $1,$ that is perpendicular to a line between the two speakers. Is this a point of maximum constructive interference, a point of perfect destructive interference, or something in between