PA 個喇叭入面的 relay 的用途是什麼？

sunwawa

如題， 射射 回答



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Ian_Seabourne

火警鐘／閃燈不是每個房有，加上有些門／牆較為隔音，火警時 mute 咗喇叭，停播任何BGM／影片音效，確保大家聽到警鐘聲。

behappy

On detection of an emergency signal from the main public address system, a relay will ensure that the local public address/music system is disconnected from its loudspeakers and that these are then connected to the main public address emergency line.

sunwawa

消防用的。 明白了 師兄 謝謝你

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