GL2400
User Guide
37
Output balance options
The aux and matrix
outputs are impedance balanced as standard
operating at nominal -2dBu and with +20dBu
maximum drive. They provide similar interference
rejection to electronically balanced outputs when
connected to balanced equipment inputs. An
electronically balanced option is available if you
require nominal +4dBu and higher output drive up
to +26dBu over very long cable runs. However, it is
not usually necessary to fit this option as the
impedance
balanced
drive
satisfies
most
applications. Check that you really need the option
before fitting it.
There are two balanced driver ICs which may be
used. Either is suitable. These are available from
Allen & Heath or good electronic component
suppliers. The Allen & Heath part number is shown
below:
SSM2142P
A&H Part AE0302
DRV134
A&H Part AE5725
For each aux master, snip the legs of the two zero
ohm resistor links next to the IC socket. This
removes them from the circuit. Now simply plug the
option IC into the socket. Observe the correct IC
pin1 orientation and make sure its legs are correctly
aligned with the socket. Test the output once the
work is complete. You should measure the same
level but opposite polarity signal between + (hot)
and ground, and – (cold) and ground.
Sys-Link V2 input/output option
A blank
plate is fitted here as standard. This may be
replaced with an optional card which provides the
console inputs, outputs and PFL system on two
37way D connectors for linking to other Allen &
Heath consoles already fitted with Sys-Link V2. The
GL2400
can become an input channel expander
(slave) or have its number of input channels
expanded (master) when linked to other consoles.
A 37way shielded multi-core cable carries the
balanced mix signals and PFL/AFL system to or from
the other console.
IMPORTANT:
Note that you need a 37 to 25way
adapter cable if you are connecting Sys-Link V2
(Version 2) to the older Sys-Link V1 (Version 1)
standard.
For full details please refer to the Sys-Link option
Applications Note AP6050 and Fitting Instructions
AP6049.
SLAVE CONSOLE
GL2400
SYS-LINK V2 OUTPUT
GL2400 OR OTHER A&H CONSOLE
SYS-LINK V2 INPUT
MASTER CONSOLE
37WAY CABLE
SYS-LINK V2 OUTPUT
SYS-LINK V2 INPUT
MASTER L
AUX5
BALANCE
GROUP
MATRIX 1-4
BALANCE
AUX 1-4
BALANCE
MASTER R
AUX6
BALANCE
