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The 28M, part of the Commercial Audio Series from Crown Audio, is a rack-mountable preamplifier/mixer ideal for use in factories, schools, hospitals, restaurants, offices, and other venues. It features eight mic/line inputs with stereo RCA jacks and balanced phoenix-type connectors and two outputs with balanced phoenix-type connectors. Priority muting is included for paging. Individual volume, bass, and treble controls are provided for each input. LED signal indicators are provided for each input and the output. A built-in tone generator provides bell, pre-announce chime, alert, and evacuate tones.