Professional audio stores sell microphones, speaker enclosures, monitor speakers, mixing boards, rack-mounted effects units and related equipment designed for use by audio engineers and technicians. Professional audio stores are also called "pro audio stores", "pro sound stores", "sound reinforcement" companies, "PA system companies" or "audio-visual companies", with the latter name being used when a store supplies a significant amount of video equipment for events, such as video projectors and screens. Stores often use the word "professional" or "pro" in their name or the description of their store, to differentiate their stores from consumer electronics stores, which sell consumer-grade loudspeakers, home cinema equipment, and amplifiers, which are designed for private, in-home use.
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