Nagra Seven Operating Instructions Manual page 27

Analog levels screen
For each input, the current microphone input levels in dBSPL, or Line input level in dBu can be displayed. If
they are assigned to the pots, then the up/down keys are inactive. If they are not assigned to a pot then the
levels can be adjusted using the buttons. In the example below, the both inputs are selected as line inputs and
assigned to the relevant pot. They can be modified with the UP/DN buttons, or by using the EDIT LEVEL button
where the exact value can be entered directly, as shown in the picture below.
Chapter III
The acronym dBSPL means "Decibels of Sound
Pressure Level" If the modulometer shows and
average of -10dBfs (full scale), and the dBSPL level
on the fuel gauge of display scale of the input
potentiometer shows 94dB, then this means that
the acoustic level on the input of the capsule of the
microphone is actually
94-10=84dBSPL
26
July 2014