5.4. Input processing
The processing available for each audio input channel is the following:
1) Volume, Mute, polarity inversion and delay (up to 1 second, displayed in units of time or
distance) controls. Also included are 2 level meters ("pre-processing" and "post-processing")
for the input channel.
2) CROSSOVER, or low-pass and high-pass filters to define a frequency range to work on,
amongst the entire audible spectrum . Available filter types are:
• BYPASS (filter not activated)
• BESSEL 12, 18, 24 or 48 dB/oct
• BUTTERWORT H 6, 12, 18, 24 or 48 dB/oct
• LINKWITZ-RILEY 12, 24 or 48 dB/octave
3) PARAMETRIC EQ, or parametric equalization filters to enhance or attenuate different
frequency ranges of the signal. 8 filters of t his t ype are available for each input , and each one
of them can have the following setting:
• BYPASS (filter not activated)
• Parametric EQ (controls for frequency, Q or filter width and g ain or attenuation of the
affected band)
• HIGH SHELF, 6 or 12 dB/octave
• LOW SHELF, 6 or 12 dB/oct ave
• HIGH PASS, 6 or 12 dB/octave
• LOW PASS, 6 or 12 dB/oct ave
• ALL PASS, 1st or 2nd order
4) COMPRESSOR/LIMITER, or dynamics processor of the input channel, with signal-peak
detection. It has the f ollowing controls:
• THRESHOLD: activation threshold of the processor (dB)
• RATIO: gain reduction of the processed (compressed) signal compared t o t he
incoming signal
• ATTACK: time it takes the compressor to start compressing after the threshold has
been reached