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Allen-Heath QU-16 Manual

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Qu-16 User Guide 19 AP9031 iss.3
Use the In key to switch the compressor in and out
and turn up Gain so that the average volume is similar.
Attack sets how fast the compressor starts to work
when the threshold is reached. Release sets how fast
it stops compressing when the signal drops below the
threshold. For example, adjust these to achieve a
‘punchy’ dynamic sound, or smooth out the response
to reduce an audible ‘pumping’ effect.
Two ‘knee’ settings are available. Hard Knee means
that compression is applied at the set ratio as soon as
the threshold is reached. Soft Knee means that the
compression ratio increases gradually from 1:1 to the
set ratio as it approaches the threshold. The curve
illustrates this.
4 Compressor types are available using the drop-
down menu. Two ‘Manual’ types allow user control of
attack and release. Two ‘Auto’ types provide automatic
control of the compressor dynamics.
Experiment with the effect of the compressor settings
on different sounds. Try to use compression only
where it is needed, and avoid compression in stage
monitor speakers.
Mix processing
The mix masters provide PEQ, GEQ, Compressor, FX
Insert capability and output Delay.
Insert switches an internal FX in or out if one has been
patched into the mix. The button is disabled when the
insert is not patched. The FX is inserted at the start of
the processing before the EQ.
Use the FX / Back panel screen to choose and assign
one of the 4 internal FX as an Insert into a mix.
Delay up to 170ms can be added to each mix output.
This is typically used to time align the PA to the
acoustic sound from the instruments on stage, or to
align fill loudspeakers to the main PA. Allow 1ms per
foot distance as a starting point.
GEQ (graphic equaliser)
A GEQ is provided along with the PEQ on all mixes
and LR. This is a popular tool for tuning out resonant
frequencies in PA systems, for example when ringing
out monitor speakers.
The Graphic Equaliser allows tonal adjustment of the
overall mix sound. It splits the 20Hz to 20kHz audio
frequency range into 28 standard 1/3 octave bands
from 31.5Hz to 16kHz allowing +/-12dB cut or boost.
Touch the screen In button to switch the GEQ in or
out. Touch a slider to highlight it and use the screen
rotary to cut or boost its frequency. This affects a
small range of frequencies 1/3 octave wide centred on
the frequency marked below the slider. The position of
the sliders shows the approximate shape of the
resulting frequency response curve.
… 19 …


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