What is the line level signal level?

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What is the line level signal level?

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“Depending on the application, line levels are stated in units of either decibel volts (dBV) or decibel volts unloaded (dBu). Consumer audio equipment line levels are rated in dBV, and the most commonly used reference level for such equipment is -10 dBV, which corresponds to a signal of about 0.3162 volts RMS (this is 0.8944 volts peak to peak). Professional audio equipment line levels are rated in dBu, and the most commonly used reference level for such equipment is +4 dBu, which corresponds to a signal of about 1.228 volts RMS.” [10] There is a handy dB Conversion Tool here.