QSC is an American manufacturer of audio, video and control products such as amplifiers, loudspeakers, cameras, video endpoints, and digital signal processors including the Q-SYS networked audio, video and control platform. QSC and Q-SYS products are used by audio and video professionals for commercial applications, including corporate, higher education, sports venues, themed entretainment, and cinema customers worldwide. The company holds five offices in the United States, including Austin, Boulder, Fort Wayne, San Luis Obispo, and its headquarters in Costa Mesa, with further international presence in London, Nieuwegein, Sinsheim, Zurich, Wattens, Dubai, Hong Kong, Beijing, Singapore, Bangalore, and Tokyo.