In digital audio, 0 db usually means full scale audio. it should be listed as 0 dbfs. Decibels are a ratio between a reference level and a value. The full scale reference is the maximum possible level without clipping and distortion. That’s why it is so important. Normal levels are all negative values.
In analog, it is a certain power or voltage. Pro analog audio uses +4 dbm (0 dbm=1 milliwatt. Consumer audio uses -10 dbV.
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