ALLEN & HEATH GL 2000 User's Guide download pdf (Page 9)

GL2200 USER GUIDE

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.

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ALLEN & HEATH GL 2000 User's Guide Page 9