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Allen-Heath QU-16 Manual

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Qu-16 User Guide 17 AP9031 iss.3
Gain
Turn up Gain so that the average loud signal reads
into the yellow of the meter. Turn down if any red peak
light flashes.
Polarity
Touch Ø to reverse the polarity of the input signal, for
example that of the lower mic when working with two
microphones on a snare drum.
Other functions in the Preamp section
Insert switches an internal FX in or out if one has been
patched into the channel. The button is disabled when
the insert is not patched. The FX is inserted between
the preamp and EQ.
Use the FX / Back panel screen to choose and assign
one of the 4 internal FX as an Insert into a channel.
Delay up to 85ms can be added to each input
channel. In most cases delay is not needed, but can
be useful in time aligning sound from the PA to the
acoustic sound from an instrument on stage. Allow
1ms per foot distance as a starting point.
Linking lets you gang the preamp, processing and
routing of an odd/even mono channel pair for stereo
operation. All parameters including the preamp,
processing and routing are linked. Pan becomes a
width control when linked. Some parameters can be
removed from the link using the buttons:
Preamp – Gain/Pad/48V, Polarity
Dynamics (Compressor and Gate) - Side Chains
Main mix – Fader/Mute, Pan
Touch Apply to accept your changes.
Gate
The Noise Gate can be switched in to dynamically turn
off the audio when it drops below a certain level. For
example, to reduce resonant decay of a kick drum or
floor tom, or hiss of a noisy keyboard.
Use the In key to switch the Gate in or out. This is
similar to inserting an outboard rack mounted device
into the Insert socket on an analogue console channel.
Set Depth for how much signal reduction you want
when the gate closes. 20dB is a typical setting. Sound
check the instrument and reduce Threshold to shut off
as much of the tail of the signal as you want. The GR
indicator lights and red screen meter shows the
amount of reduction when the gate is closed.
Hold sets how long the gate remains open after
dropping below the threshold. Attack sets how fast the
gate opens when the signal rises above the threshold.
Release sets how fast it closes when dropping below
the threshold. Experiment with these controls to
achieve smooth operation without a pumping effect.
Peak
Gate active
GR = Gain Reduction
HPF GATE PEQ COMP
DELAY
0
Gain/Trim
Insert
Post-Preamp Pre-EQ Post-EQ Post-All
… 17 …


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