"Lord Hasenpfeffer" wrote in message
..

dB or dBFS?

dB is a relative term, and by itself means nothing.

dBFS is decibels relative to a real figure, relating to the analogue level
represented by a digital word at "all 1's" .

dBV, dBM, and dBU are other varieties of dBs refernced to a specific actual
voltage/power.

Read a book.

geoff