Nagra Seven Operating Instructions Manual page 29

Filters
The Nagra Seven is equipped with fully programmable internal digital filters. These filters can be
programmed for each microphone input independently. The frequency of the filter, from 30 Hz to
300 Hz and the slope of either 12 or 24 dB/Octave and the headroom, from 0 to 42 dB can be
programmed using the settings window.
The headroom can also be used by the filters if necessary, this can be useful when low frequencies are too
loud (wind noise for example) and may saturate the A/D converter; as the filtering is done next to A/D
conversion rather than in the microphone preamplifier, it will not prevent the saturation.
Chapter III
The settings window accesses all the specific
parameters of the digital filters.
28 September 2014