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METERS - DB SPL vs DB FS vs VU DB FS (full scale) meters – software and hardware Digital meters that measure signal strength in a soft ware device. VU (volume unit) meter – analog meters that measure signal level (0vu = -20db fs/-18db fs) Db SPL – measure sound pressure, the condensation and rarefaction of sound in air (via a microphone) (i.e. real sound) C-weighting/Slow Response- for measuring Standard Settings 79dbSPL for Small Theater/Mixing Spaces 83dbSPL for Mid Sized Theater/Mixing Spaces 85dbSPL for Large/Standard Theatrical Spaces/Mix Theaters