American Dynamics AD1475A DuoQuad is an industrial quad video multiplexer and playback switcher that handles four video inputs and provides two video outputs for real-time quad display. It includes on-screen menus and a programmable microprocessor control unit, plus alarm inputs and an alarm output, and it offers a dedicated call output for signaling. An optional ADTC accessory adds date and time to the on-screen displays and enables RS-232 remote control. This model is described in historical catalogs as a discontinued, industrial unit commonly used in multi-camera setups.
