Loudspeaker-Control Unit, LS-671/U (loudspeaker). Used for monitoring voice com-
munications in vehicular installations. Refer to Chapter 1 for connection to vehicular
Power switch. Used to turn loudspeaker on and off. May also be used to turn power
on and off to mounting adapter if mounting adapter CB1 is set to ON.
Power indicator lamp. Lights when power switch is set to ON.
Volume control. Adjusts volume level of loudspeaker or handset (if connected). To
adjust volume level for handset, turn clockwise to increase volume: turn counter-
clockwise to decrease volume. To adjust volume level for loudspeaker, pull and turn
clockwise to increase volume; pull and turn counterclockwise to decrease volume.
Handset connector J2. Used to connect handset.
J1. Connects to mounting base or single radio mount connector J3 or J4 using speak-
Loudspeaker LS-454/U (loudspeaker), Used for monitoring voice communications
in vehicular installations