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Allen-Heath GL 3300 Manual

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GL3300 U
G
UIDE
11
INPUT CHANNELS
Plug in a microphone or line level source. Use
balanced cables where possible to prevent
interference pickup on long cable runs.
Unbalanced sources may be connected by
linking signal cold to ground (XLR pin 3 to pin
1, jack ring to sleeve) at the connector.
For line sources on XLR simply
plug into the XLR with the jack
socket unplugged.
For balanced microphones which require
phantom power select +48V. If required this
switch may be disabled by an internal link.
Switch off channel +48V when the inputs are connected to non-
phantom powered, line or unbalanced sources.
F
Use the PFL system to listen
to the signal and fine tune the
gain setting.
MONO
STEREO
φ PHASE reverses the phase of the input
source to correct the phase differences often
encountered in microphone placement, or due
to incorrectly wired cables (pin 3 hot instead of
pin 2). May also be used to minimise acoustic
feedback between closely positioned
loudspeakers and mics in live sound mixing.
The stereo φL reverses the left input phase only
to correct for differences between left and right
signals, or for MS microphone techniques.
MIC/LINE selects line sensitivity on the jack
input when pressed. Or becomes a 20dB pad
for the XLR input when no jack is plugged in.
GAIN matches the level of the input source to
the normal operating level of the console.
Adjust this to read an average '0dB' on the
channel meter (yellow LED). Use the PFL
system to listen to the signal and fine tune the
gain.
100Hz lo-cut filter removes low frequency
noise such as microphone pops, stage noise
and transport rumble before the pre-amp stage.
The lo-cut filter is independent of the equaliser.
The 4-band EQ lets you adjust the tonal
quality of the sound in 4 separate bands. HF
(treble) and LF (bass) are shelving while the 2
mid bands MF1 & MF2 are peak/dip with a Q
of 1.6. This is optimum for both corrective and
creative equalisation. The controls are centre
detented for centre flat response. Press EQ IN
to switch the EQ into the signal path.
The 2 mid frequency bands on the mono input
channel may be swept across a wide frequency
range to tune into the exact frequency required.
The mid bands are overlapping to provide
additional cut or boost when required.
The EQ on the stereo inputs has the 2 mid
frequencies at 250Hz and 2.5kHz. This
provides optimum control over boomy or boxy
sounds (MF2), and to add presence and sparkle
to vocals etc. (MF1). The stereo channels are
well suited to stereo miking, dual mic mixing,
or returning keyboards and effects processors
to the mix and monitors.
Both L and R up gives you a
true stereo channel. Press both
to mono the source. Press just
one to select one side only as
a mono source.
Separate GAIN
controls for L and
R inputs let you
adjust the balance
between the
sources, or treat
each as a separate
source.
For line sources on
XLR simply plug
into the XLR with
the jack socket
unplugged.
Plugging a jack into the INSERT socket
breaks the signal path between the input
preamp/filter and the EQ to let you add an
external signal processor such as a compressor
or noise gate into the channel signal path
Use a suitable Y-lead or suitable TRS jack
lead to connect to the external processor.
… 11 …


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