功能特点
每套 12L 可直接连接会议话筒或普通有线话 12 套，共同为一个输出端输入功放，
如需多套时可叠加。
设有高、低音调试。
设有每支话筒灵敏度调试。
设有前置总输出调节。
设有高深度混响功能。
Each set of 12L can connect directly with 12 sets conference microphone or wire
microphone. They all input the amplifier for one output jack.
With high & low volume debugging.
Each microphone h***e sensitivity debugging.
With total output and adjustable function in the front.
With deep nominal deviation reverberation function