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A measurement of the logarithmic difference in voltage from 0dBV (1.0 V , the reference being 1V RMS). A unit of measurement of audio signal level in an electrical circuit, expressed in decibels referenced to 1V RMS across any impedance. Commonly used to describe signal levels in consumer equipment. To convert dBV to dBu, add 2.2 dB.

Source: Church Audio & Acoustics Glossary

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