ALLEN & HEATH GL 2000 User's Guide download pdf (Page 14)

14 GL2400 User Guide

The Console Connectors

MONO CHANNEL MIC / LINE IN The LINE (PAD) switch selects

either the MIC XLR or the LINE TRS jack as the input source. The XLR is

normalled through the TRS jack so that it can be used for microphone or

line level signals when nothing is plugged into the jack socket. This gives

the channel preamp a massive headroom with +34dBu maximum input

capability using XLR or jack. Both inputs are balanced but can be wired

to work with unbalanced signals when

required. The MIC XLR can be switched to

provide +48V DC via 6k8 ohm resistors to

pins 2 and 3 for microphones such as

condensers which require phantom powering.

WARNING: Do not connect unbalanced sources or cables to

the XLR input when 48V phantom power is selected. To avoid loud

clicks always turn the channel off by pressing MUTE when switching

+48V on or off, and when plugging or unplugging cables.

STEREO CHANNEL MIC IN Each stereo channel features a

mono microphone XLR input and two independent stereo line inputs. The

balanced MIC input accepts a maximum +14dBu and can be switched to

provide 48V phantom power.

STEREO CHANNEL MIC OUT The output of the mic preamp is

available on the MIC OUT (BREAKPOINT) TRS jack socket. This is

impedance balanced and operates at a nominal 0dBu line level.

Plugging into this socket breaks the signal into the associated stereo

channel. This means that the mic preamp can be used independently of

the channel, for example to create an ambience mic feed for recording, or

as a preamp for an RTA measurement system.

STEREO CHANNEL LINE IN Stereo inputs ST1 and ST2 feed

channel 15, and ST3 and ST4 feed channel 16 respectively, or can be

routed directly to LR. These inputs use TRS jacks. ST1,3 are

unbalanced, ST2,4 are balanced. Unbalanced inputs automatically

connect the TRS ring to ground when working with balanced sources.

The L input is normalled through the R socket to accept mono signals on

a single jack.

INSERT A single 3-pole TRS jack carries the unbalanced insert signal

for each mono channel and main mix output. Tip = send, Ring = return,

Sleeve = common ground. The channel inserts are post-HPF, pre-EQ

and operate at 0dBu. The group (aux) and LR mix inserts are pre-fader

and operate at -2dBu. Use these to patch in line level signal processing

equipment such as compressors, outboard EQ, delay units and so on.

The wiring of a suitable cable is shown in the diagram.

DIRECT OUTPUT Each mono channel direct output is available on

an impedance balanced TRS jack providing a line level signal operating at

0dBu. The source is set using an internal option jumper for each channel.

The factory default setting is pre-fade (following the pre/post-EQ setting).

This may be changed to post-fade if preferred.

LAMP The 16 channel console has one, the larger models have two

4pin XLR sockets to plug in standard 12V gooseneck lamps to illuminate

the operating surface when working in a dark environment. Only use

lamps intended for this purpose. We recommend the Allen & Heath

LEDlamp with cool white LED illumination and a built in dimmer.

- IN

+IN

INPUT

RING -INRING

TIP +INTIP

LINE

MIC

MIC IN

LINE IN

DIRECT

INSERT

OUT

GROUND

RETURN

SEND

RETURN

OUT

SEND

PROCESSOR

LINK RING TO SLEEVE TO UNBALANCE

MIC OUT

ST4 ST3

L/M

MIC IN

(BREAKPOINT)

SEND

INSERT

RETURN

TIP

RING

LAMP

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 39 40

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ALLEN & HEATH GL 2000 User's Guide Page 14

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