You got the first part sorta right. 0 dbu = 0 dbv (not dbvu) = .775 v
VU is a type of average metering as opposed to peak metering which reads instantaneous peaks
but VU is not a reference level
But dbFS has a maximum of zero and should be the same on all converters. Otherwise there wouldn't be a proper reference between systems. Some people's 0 would be louder than others and that wouldn't make any sense.
RMS is root mean square which is basically like VU though a bit different. This gives you an average level and will always be several db lower than your peak level.
0 dBfs = +18 dBu (IIRC international TV standard)0 dBfs = +20 dBu (IIRC international cinema standard)
+4dBu into the Alesis HD24XR measures as -15dBFS, on both the meters and the recorded waveform amplitude. 0dBFS = +19dBu, and that's all, folks.It took reading Bob Katz's Mastering Audio: the Art and the Science to finally convince me to let go of trying to "use all the bits."
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