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Sound for Digital Video, 2nd Edition by Arthur Baum, Tomlinson Holman

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Chapter 6

Production Sound III: Dealing with the Output of Microphones

Microphones are called, as a general class, transducers, changing acoustical energy, sound, into electrical energy, voltage. They typically put out much lower voltage levels than most audio gear, so they must be amplified by a microphone preamplifier to be brought up to usable levels. A typical amount of voltage delivered by a professional microphone is 13 mV (0.013 V), a rather small voltage, for 94 dB SPL, 1 a rather loud level. Thus microphones must be connected to microphone inputs as opposed to line inputs, and the converse is true, too: line-level devices such as CD players must be connected to line-level inputs and not mic inputs. If a line-level device is connected ...

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