Product & Services

Public Addressable System

PA System

A Public Address or "PA" System is an electronic amplification system with a mixer, amplifier and loudspeakers, used to reinforce a given sound, e.g., a person making a speech, prerecorded music, or message, and distributing the sound to the general public around a building.

Simple PA systems are often used in small venues such as school auditoriums, churches, and small bars. PA systems with a larger number of speakers are widely used in institutional and commercial buildings, to read announcements or declare states of emergency. Intercom systems, which are often used in schools, also have microphones in each room so that the occupants can reply to the central office. The simplest PA systems consist of a microphone, a modestly-powered mixer-amplifier (which incorporates a mixer and an amplifier in a single cabinet) and one or more loudspeakers. Simple PA systems of this type, often providing 50 to 200 watts of power, are often used in small venues such as school auditoriums, churches, and small bars.

Voice Alarm Call Station

The Plena 6-zone call station is a stylish high quality call station with a stable metal base design, a flexible microphone stem and a unidirectional condenser microphone. It is intended for making calls to selected zones (1 to 6 and all-call) in a PA system built around the LBB1990/00 Voice Alarm System. Except for table-top use, the special design allows also for neatly flush mounting in desk tops. The Plena Voice Alarm Keypad (LBB 1957/00) is an extension adding 7 additional function keys.


pa-systemOn each call station it is possible to select 6 zones with the possibility to connect up to 8 call station keypads (LBB 1957/00) to increase the number of zones or zone groups that can be selected. Each keypad adds 7 zone or zone group keys. This call station features selectable gain, a selectable speech filter and a limiter for improved intelligibility, even if the speaker moves in front of the microphone. Because the call station provides a balanced line level output, it can be positioned up to 1000 m away from the controller, using CAT- 5 extension cables. Using dipswitches on the bottom of the call station different microphone gain levels can be select ass well as the call station ID and the speech filter. Selected zones are indicated with LEDs on the call station, three additional LEDs give visible feedback on the active state of the microphone and the system. Green indicates microphone active, amber indicates that the system has detected a fault (IEC 80649) and red indicates that the system is in the emergency state.