The listening system is a sound system established by the hearing problem of controlling indoor audio operators. During the performance, the main speaker is located at the main sound of sound insulation with the control room. The audio operator cannot directly hear the effect of the main speaker and the sound of the sound, so that you cannot work. Therefore, it is necessary to install a monitoring system that synchronizes the audio audio audio sound field in the control room to help audio operators understand the audio effect of the main sound field in order to adjust the sound at any time. Therefore, for the audio systems of various halls, the listening system is also essential. In general, the monitoring system's power can take 10%of the main sound field power. In the monitoring system, in order to monitor the effect of not being disturbed, monitoring the power of the large device can be equal to the power of monitoring speakers. In actual use, monitoring the output power of the amplifier must be debugged on the spot. If the power of the monitoring system is too small, the monitoring system will lose its meaning; the power of the monitoring system is too high, and it will make the control room too noisy and affect the operator's work. Therefore, before the program starts, the monitoring system should be adjusted to the appropriate loudness.