Manual Allen-Heath GL2200 (page 13 of 28) (English)

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GL2200 USER GUIDE

STEREO INPUT CHANNEL

Two stereo input channels are included as standard. Each features a 4-band

EQ, 6 aux sends and group routing. Use this channel for stereo sources such

as keyboards and two track players, or for returning additional effects

processors to the mix and monitors. A mic input is included so that you can

use the channel for additional mics when needed. The stereo line input can still

be routed to the mix while using the channel mic input.

The stereo inputs are on separate TRS jacks. For mono line sources plug into

the L/MONO jack socket only. For microphone sources plug into the XLR.

48V selects +48V DC to the XLR input for microphones that require phantom

power.

IMPORTANT NOTE : Switch off channel +48V when non-phantom

powered or unbalanced sources are connected to the XLR input.

reverses the POLARITY of the input source to correct problems often

encountered in microphone placement, or due to incorrectly wired cables (pin 3

hot instead of pin 2). May also be helpful in reducing acoustic feedback

between closely positioned loudspeakers and mics in live sound mixing.

GAIN controls for the MIC and LINE inputs let you adjust each source

independently.

LINE TO L-R routes the stereo line source direct to the L-R mix. In this way

both the mic and stereo line inputs may be used at the same time. The mic

can be routed through the stereo channel while the line input becomes an

independent source or return to the LR mix.

MIC/LINE selects either the mic XLR or the stereo line jack inputs to the

channel. When selecting LINE on the second stereo input channel, the MIC

input section is available as the source for talkback. A green LED indicator

illuminates to confirm this. The channel can be used with the stereo line input

in the normal way while the mic is independently used for talkback.

The 4-band stereo EQ lets you adjust the tonal quality of the sound. The HF

(treble) and LF (bass) bands have a shelving response, which means that all

frequencies beyond the corner frequency are affected. The 2 mid frequencies

MF1 and MF2 provide optimum control over boomy or boxy sounds (250Hz),

and can add bite or reduce harshness to keyboards, vocals etc. (2.5kHz). The

centre flat position is detented for quick resetting.

6 AUX SENDS provide feeds for foldback monitors and effects. Aux 1-4 and

Aux 5-6 may be set to pre or post-fader using the PRE switch. The left and

right stereo signals are summed to provide aux feeds in mono.

Monitor sends to the performers are usually set pre-fade (PRE), although

some sources such as radio mics are often set post-fade to avoid ‘dressing

room’ talk spill.

Effects sends to external signal processing equipment such as reverb and

delay effects units, are usually set post-fade so that the amount of effect (wet

signal) is always relative to the position of the fader (dry signal).

Adjust the amount of effect required for each channel using its AUX control.

The effect is returned to the mix through another channel, usually the stereo

return described later in this guide.

POST-FADE sends are post-EQ, post-mute

. PRE-FADE sends are set post-

EQ, post-mute as standard. Internal link options are available to change the

source of the pre-fade sends. Refer to the internal link options section in this

user guide.

Note; AUX 1-6 feed XLR outputs with inserts when the GRP/AUX

REVERSE switches are pressed in the master section.

MIC TO TALK

ENABLE

MIC TO TALK

STEREO

15-16

60dB

LINE

L-R

MIC

LINE

GAIN

48V

MIC

GAIN

LINE

250Hz

MF2

2.5kHz

MF1

+15-15

+15

-15

+15-15

EQ IN

12kHz

60Hz

+6OO

AUX

PRE

MUTE

ODD

EVEN

PEAK

SIG

L-R

BAL

PFL

1-2

3-4

OO 20

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Allen-Heath GL2200 Manual

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