弹簧钳式吸顶扬声器，把扬声器的内径放在天花板，在两边弹簧钳，钳在天花板里即可。 B. 线路敷设 ü 系统线缆采用耐火型RVS2*1.0，功放馈送回路采用二线制传送，有音量调节器的线路采用三线制传送； ü 广播线路独立敷设，不和其他线路同管和同线槽槽孔 ...

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