Rack mountable digital ambient noise controller with 2 line inputs and outputs. 1 mic sense input for optional AN-9001 mic, rack kit included (1U). Rack mountable digital ambient noise controller. Simply add output to ambient noise, making manual compensation adjustments necessary. Two balanced line inputs and outputs, one ambient noise sensor microphone input and one monitor output. Typical applications include airports, shopping malls and restaurants. The DP-L2 features a superior automatic level control (ALC) algorithm that automatically adjusts the input signal to maintain a level suitable for the surrounding ambient noise level, ensuring an appropriate input signal level at all times. A range of microphones may be used for detecting ambient noise, including ceiling flush-mounted, dynamic and condenser types. Front panel LCD and controls allow easy adjustment of all functions with input, output, ALC and ANC level metering. A key-lock protect function prevents accidental changes in front-panel settings.