Allen & Heath CQ-20B Ultracompact 20-Channel Digital Mixer (Rackmount/Stagebox) - Manual (Page 80)

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80 User Guide
V1.1.0 Issue 1
Invert Polarity – Invert the polarity of the signal. Often used where multiple
microphones are used on the same source (e.g. snare top and snare bottom)
Gain – Adjust the gain manually for the incoming signal.
Trim – Digital level adjustment, available on stereo line inputs and when an input
source is set to digital (USB/SD).
 Gain Assistant, Gain and Phantom Power are only available on Analogue Input
Sources.
Level – Displays the post-preamp (pre-processing) input level.
HPF
The High Pass Filter lets audio above a set frequency through whilst cutting out
lower frequencies. It’s commonly used wherever the low frequencies are
undesirable (e.g. microphone handling noise, traffic rumble or low background
humming) or when it is not adding anything to the mix (e.g. on predominantly mid or
high frequency sources like voice, guitar or cymbals).
Freq – Adjust the High Pass Filter frequency. When HPF is In, all frequencies above
this setting will pass whilst those below will be attenuated.
In/Out – Switch the HPF In or Out.