Allen&Heath GS3000 - Manual (Page 9)

GS3000 U SER G UIDE 9
C
ONNECTIONS
The GS3000 uses professional grade 3-pin XLR, 1/4" TRS jack and RCA PHONO sockets. The
applications diagrams in this guide illustrate typical equipment interconnections. To ensure best
performance, we recommend that you use high quality audio cables and connectors, and take time to
check for reliable and accurate cable assembly. It is well known that most audio system failures are due
to faulty interconnecting leads.
C ONNECTOR P INOUTS
C ONNECTORS , C ABLES AND T HEORY
All input and output XLR connectors are 3-wire differentially or impedance balanced. These have 3
connector pins: pin 1 = ground 0V (cable screen), pin 2 = signal +, pin 3 = signal -.
All the master output jack connectors (e.g. Tape out, Aux out, Studio out) are 3-wire impedance
balanced. These outputs provide optimum interference rejection into the balanced inputs of
connected equipment. Jack connectors have 3 terminals: tip = signal +, ring = signal -, sleeve =
ground 0V (cable screen).
Avoid reversing + and - on balanced connections as this will result in out of phase signals (reverse
polarity) causing signal cancellation effects. This situation is particularly common in multi-
microphone mixing.
Where long cables runs are required, balanced interconnections should be used. Short
interconnections between more affordable 2-wire (signal, ground) unbalanced effects units or
signal processors and mixing console may be utilised.
MIDI CONNECTIONS
Use high quality screened twist pair cable with the screen connected to pin 2 at both ends. The
cable should be no longer than 15m (50’) and terminated with 180º 5 pin male cable mount DIN
plug.
MIDI In + (pin 4)
MIDI In - (pin 5)
Not Used (pin 2)
Not Used (pin 3)
Not Used (pin 1)
Not Used (pin 1)
Not Used (pin 3)
MIDI Thru + (pin 4)
MIDI Thru - (pin 5)
Not Used (pin 3)
Not Used (pin 1)
MIDI Out - (pin 5)
MIDI Out + (pin 4)
Gnd 0V - (pin 2)
Gnd 0V - (pin 2)
MIDI
In
MIDI
Thru
MIDI
Out
Rear panel view