Line level

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Line level means audiosignals level what is example 2 Voltages peak to peak. It is common in CD-players and cassetteplayers. It is much more than microphone level which can be couple of milliVolts. Line level signal can be connect to amplifier which plays loudspeakers with much more power than linelevel uses because it's bigger currents.

Preamplifier is the device what can make linelevel signal example from microphone's weak signal.