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In this paper,the resonant frequency of the sound column is investigated both theoretically andexperimentally,and the efficiency of the sound column at resonant frequency is also calculated.It isshown that the resonant frequency varies linearly with the number N of the loudspeakers in the soundcolumn,and the efficiency of the sound column at resonant frequency is directly proportional to thenumber N of the loudspeakers if N≤3,and it tends to increase more slowly if N>4. We have also proved that the radiation of the loudspeakers treated in accordance with theradiation of a plane piston on the terminal of the long tube in the sound column is in fairly goodagreement with the results of the experiment.
In this paper, the resonant frequency of the sound column is called both is theoretically andexperimentally, and the efficiency of the sound column at resonant frequency is also calculated. It is isshown that the resonant frequency varies linearly with the number N of the loudspeakers in the sound column, and the efficiency of the sound column at resonant frequency is directly proportional to thenmber N of the loudspeakers if N≤3, and it tends to increase more if N> 4. We have also proved that the radiation of the loudspeakers treated in accordance with theradiation of a plane piston on the terminal of the long tube in the sound column is in fairly good condition with the results of the experiment.