Edwards EST 3-ZA95 Audio Amplifier (New)

Edwards EST 3-ZA95 (New)

The EST3 audio amplifiers take full advantage of proven digital technology. To deliver highly intelligible voice audio for evacuation and Mass Notification/Emergency Communication (MNEC) purposes. Digital messages are generated by the Audio Source Unit (ASU). And live paging messages a re multiplexed into eight separate channels transmitted over fiber optic cable. Or a single twisted pair of wires. Each zoned amplifier contains integrated demultiplexing circuitry. That allows any one of the eight digital audio channels to place messages. Or signals on the amplifier’s built-in speaker circuit.

Audio channel selection is network software controlled. And audio amplifiers are mounted in the same enclosures as other EST3 equipment. Power for the amplifiers comes from standard system power supplies through the local rail. Field wiring connects to removable terminal blocks on the amplifier module. Amplifiers support 25 VRMS or 70 VRMS power-limited speaker circuits. For visual signaling, each 20 or 40-watt amplifier comes standard with one 24 Vdc power limited Notification Appliance Circuit.

Application
EST3-zoned amplifier configurations offer improved reliability and performance. The configuration provides improved survivability in the event of wiring faults that result in a loss of signaling. In the example shown in the diagram, a fault on the system. Using a central backed-up amplifier disables multiple signal/page circuits. And the standby amplifier i s not able to bypass the fault. With EST3, the same fault removes the Audio Source Unit riser.

Datasheet

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