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Allen-Heath GL2200 Manual

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GL2200 USER GUIDE
9
CONNECTING CHANNEL INPUTS
Both microphone and line sources such as keyboards, replay devices and effects processors
can be plugged into either the jack or XLR input for convenience. The channel accepts a wide
70dB range of source levels. The balanced 3-wire input provides the best immunity to
interference pickup on long cable runs.
CONNECTING TO INSERTS
You do not need to plug anything into the insert socket for normal operation. You may, however
wish to insert a signal processor such as a compressor/limiter or noise gate into the signal path
to prevent excessive peaks or to cut down source noise. The insert lets you do this by breaking
the signal path after the input pre-amp and before the EQ in the channel input or before the
fader in the Group and L-R section. Use a Y-lead or suitable TRS jack lead to connect to the
external processor. The insert operates at 0dBu line level in the channel input and –2dBu in the
Group and L-R section. Adjust the processor input and output levels for optimum signal level.
CHANNEL DIRECT OUTPUTS
The channel direct output taps the signal off post-fader (pre-fader if the internal link option is
changed) for connection to external processing or recording equipment. This is ideal for
multitrack recording during a live performance. Here each channel can be recorded on a
separate track for mixdown later. The output is impedance balanced on TRS jack. This means
that you get the benefit of interference immunity when connecting to outboard equipment with
balanced inputs. You can, of course, also connect to unbalanced equipment. The signal
operates at nominal 0dBu line level.
ADJUSTING THE LEVELS
For best performance it is important that the connected source signals are matched to the “normal
operating level” of the console. Similarly the console outputs should be correctly matched to the
operating levels of the connected amplifiers and destination equipment. If too high, the signal peaks
will be clipped resulting in a harsh distorted sound, and if too low, the signal-to-noise ratio is reduced
resulting in excessive background hiss.
For best results, operate the console with the meters averaging ‘0’ or just below and allowing the
loudest passages and occasional peaks into the ‘yellow’. Reduce the gain if the peak indicators flash
(red). The GL2200 provides +4dBu output level at the XLR outputs for a meter reading of 0VU. It is
advisable to adjust the power amplifier input gain or fit an attenuator pad if normal console operation
results in an output level too high for the connected amplifier. Normal operation should give rise to
fader levels around the ‘0’ mark.
The GL2200 has an advanced PFL (pre-fade listen) / AFL (after-fader listen) and channel metering
system to let you listen to and check the level of signals at different points in the signal path without
affecting the main outputs. Use the channel PFL switches to set up the input GAIN controls to read an
average ‘0’ (yellow LED). Signal activity is always shown on the channel meters regardless of fader
position. The green ‘SIG’ LED lights at -20dBu to indicate signal presence, the yellow ‘0’ LED
indicates normal level, and the red ‘PEAK’ LED warns of potential overload 5dB before clipping.
… 9 …


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