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The AV-1 Audio-Visual Interface allows the line or speaker level outputs of movie projectors, audio and video tape/cassette recorders, phonographs, etc., to be connected to the microphone inputs of house or portable P.A. systems for programs in school auditoriums, lecture halls, civic meetings and corporate board rooms. Input: 1/4" (6.3 mm), RCA, and 3.5 mm jacks, as well as a LINE/SPKR switch to allow input from the speaker outputs of older tube-type equipment (16 ohm, 5 watt dummy load). The HI/LO switch allows greater flexibility for handling line output sources at either "hi-fi" (-10 dBV) or "professional" (+4 dBm) levels. Output: 3-pin male balanced XLR connector (uses DBT-1 transformer) and a 1/4" (6.3 mm) unbalanced line-level output. Includes GND/LFT switch to eliminate hum and buzz from AC ground loops. The rugged "Uni-box™" construction provides protection and shielding. Made in the U.S.A.