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Shaping Sound in the Studio and Beyond: Audio Aesthetics and Technology by Gary Gottlieb

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Impedance

The difference between mic level signals and line level signals is not described as simply a difference in level, it is described as a difference in impedance, and that has other extremely important implications. A mic level signal, at somewhere around –65 dB, is known as a low-impedance signal and can travel long distances through cable without significant loss because such small amounts of electricity encounter little resistance. Conversely, a line level signal is at or about optimal console level, somewhere between –30 dB and 0 dB, and is also known as high impedance. Due to its higher level of current, a line level signal sent through a long cable will experience resistance resulting in deterioration, or signal loss. Some consumer ...

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