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采用模拟法在半消音室环境里对平面扬声器和动圈式扬声器的灵敏度进行测试,在音频范围内按1/3倍频点选择测试点。搭架数字信号采集系统并调节功率放大器以保证扬声器的输入功率恒定1 W,记录离扬声器轴向1 m处声压计的读数。选取力学参数相差较大的玻璃板、五夹板和ABS塑料板为振动薄板,同时每种材质都有大小相同的两种尺寸。测试结果表明:动圈式扬声器在高频区输出响应下降趋势比平面扬声器明显,平面扬声器的高频响应较好,带宽较宽;灵敏度与振动薄板的材质与面积均存在着一定的关系,声速较高的材料灵敏度相对较高,而面积较大的则低频响应相对强。
The sensitivity of planar loudspeaker and moving coil loudspeaker is tested in the semi-anechoic chamber environment by analog method, and the test point is selected by 1/3 octave frequency in the audio range. Frame the digital signal acquisition system and adjust the power amplifier to ensure that the speaker input power is constant at 1 W and record the sound pressure meter reading at 1 m from the loudspeaker in the axial direction. Select the glass plate with large difference between the mechanical parameters, five plywood and ABS plastic plate for the vibration of the plate, while each material has the same size of the two sizes. The test results show that the output response of moving coil loudspeaker in the high frequency region is lower than that of the flat loudspeaker. The high frequency response of the flat loudspeaker is better and the bandwidth is wider. The relationship between the sensitivity and the material and the area of the vibrating sheet has a certain relationship, The higher material sensitivity is relatively high, while the larger the area, the bass response is relatively strong.