The result shows that different front cavity volumes of microphones will result in different sound pressure levels in the cavity of high pressure coupler at the frequency range and the same insert voltages of the calibrator. 结果表明,保持校准器插入电压不变的条件下,在其工作频率范围内,传声器前腔体积变化,会使校准器腔内的声压级随频率产生不同程度的变化。