4 external audio switch – DynaScan Outdoor 360 Degree LED Video Display DS0706 User Manual
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4.4 External Audio Switch
You can use External Enable switch to choose Audio output or External Audio as the Audio
source. When the status of it is open (default), the source is Audio output. When it is
shorted, the source is External Audio.
Volume
Ext. Audio In
External Enable switch
Speaker Connectors