英语翻译Two loudspeakers are one meter apart and radiate the sam

英语翻译Two loudspeakers are one meter apart and radiate the same sound pressure level.a listener is two meters directly in front of one speaker on a line which is perpendicular to the line joining the two loudspeakers; see Figure 2.What are the first twofrequencies at which destructive interference occurs?When does the listener first experience constructive interference,other than at very low frequencies?