ALLEN & HEATH GL4800 User's Guide download pdf (Page 50)

50 GL4800 User Guide

The Monitors

Otherwise known as foldback or cue sends, the monitor mixes are created from the console

aux sends. These feed amplifier/speaker systems positioned on-stage for the performers,

backstage for the stage crew, in the pit for the orchestra, and so on.

The channel aux sends are usually set PRE (pre-fade) for monitors so that they are

independent of the front-of-house mix levels. However, you may chose to set certain

channels POST such as radio mics to prevent 'dressing room talk' or background

noise getting to the monitors.

The aux outputs are balanced XLR to drive the long cable runs to the amplifiers. Use

the inserts to patch in the graphic EQ or other signal processing devices required.

You should 'ring out' the monitors and set the EQ to minimise the effect of acoustic

feedback. The effect on the signal can be checked using AFL.

Effects

This example shows auxes 5 to 8 sending console signals to external effects units such as

reverbs and multi-effects processors. The sends are set POST so that signal sent to the

effects unit always follows the fader level. The processed signal is returned to the mix via

an input channel, usually a stereo channel.

If you are using the stereo channels for additional mic inputs you can still route the

return signal to the stereo line input and press DIR to LR.

Use WIDTH to adjust for the required stereo image from reversed stereo, through

mono, to normal stereo, and on to 'wide' for enhanced stereo.

Check the incoming 'wet' signal using STEREO PFL.

If it is more convenient to use jack outputs instead of XLRs for the effects sends then

simply press

 OUT REV to swap with the related matrix or LR2 output.

For local effects (associated only with one channel) press the channel  DIR

OUT switch and use aux 10 level to adjust the amount of effect.

Inserted Signal Processing

Apart from EQ, delay and other processing inserted into the main outputs you can similarly

plug external signal processing devices into the input channel and group signal paths.

Noise gates can clean up noisy sources such as keyboards when they are not played. Spill

from drum mics can be reduced by gating them. Compressors can be useful on vocals to

control the dynamic range.

Feed the console signal to the device from the INSERT SEND and return the

processed signal to the INSERT RETURN. Plugging into the return breaks the signal

path within the console.

Local Monitoring

2 stereo headphone outputs and a separate stereo 'local monitor' output with its own level

control are provided so that the console signals can be checked independent of the main

outputs. It is increasingly common during system rigging and sound checking to monitor

using speakers positioned at the console.

Select L-R MIX to check the stereo LR output. This is interrupted by any pressed

AFL which in turn is interrupted by PFL. This lets you monitor the selected output

using AFL (for example matrix) and check channel signals quickly by pressing PFL.

Turn off L-R MIX to keep the monitors quiet unless AFL or PFL is selected. This

prevents unnecessary distraction during a live performance.

Check the mono compatability of a stereo signal by pressing MONO. The L, R and

M meters also provide a visual check.

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ALLEN & HEATH GL4800 User's Guide Page 50

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