厅堂中扩声系统,主要由四个部分组成。首先将声转换为电,这是由机——电换能器(俗称话筒)来完成;然后将转变成的电信号进行电压放大并作必要的调整和音质修饰,这一工作由调音台来完成;由调音台出来的电信号的功率还不足以驱动扬声器工作,因此在扬声器和调音台之间配接功率放 Hall sound reinforcement system, mainly composed of four parts. First, the sound is converted to electricity, which is done by the machine-to-electricity transducer (commonly known as the microphone); then the converted electrical signal is amplified in voltage and the necessary adjustments and sound quality modifications are performed by the mixer To complete; power from the mixer out of the electrical signal is not enough to drive the speaker, so the speaker and mixer with power amplifier