音响系统应使之工作在额定电平上，为此各类专业音响设备的输入电路中都设置了峰值（Pf：alC）指示或过载指示，在调音台上由增益钮（GAN）控制。使用时最好将输入电平控制在指示灯刚好点亮的位置上，有人认为只要峰值（PEAK）灯调整在不断闪动的状态即可，其实峰值指示灯不断 The sound system should be operated at rated level, for which the Pf: alC indication or overload indication is set in the input circuits of all types of professional audio equipment and is controlled by the gain knob (GAN) on the mixer. It is best to use the input level control in the light just lit position, some people think that as long as the peak (PEAK) light adjustment in the constantly flashing state, in fact, the peak light continuously