1-2 Overview
Features■ Allows automatic, manual or remote control of sound system levels.
■ It has an SPL meter with over 50 dB range built in.
■ The microphone can be placed up to 5000 feet from unit.
■ Simplicity in set up and operation.
■ Single rack space - 1 RU.
■ Balanced 600 ohm inputs and outputs.
■ Line input activated by a contact closure.
■ Loop start TELCO input with priority over line input.
■ Clock inputs or remote control connections.
■ Relay outputs for emergency override or indicators.
■ Line output and a contact closure to supervise downstream equipment.
■ Internal microprocessor senses ambient noise via a microphone input, and
adjusts the paging level accordingly.
■ Rack or wall mount.
■ UL listed power supply, FCC Part 15 approved.
Figure 1-1 shows a back view of the Ambient Level Controller (ALC) and
Figure 1-2 shows a front view of the ALC. Figure 1-3 shows a block diagram
of the ALC.