Allenheath WZ14-4-2 User Manual download pdf (Page 10)

10 WZ14:4:2 USER GUIDE

PLUGGING UP THE SYSTEM

The Mix Wizard 14:4:2 uses professional grade 3-pin XLR, 1/4" TRS jack and RCA PHONO

sockets. The applications diagrams on pages 5 to 7 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.

CONNECTOR PINOUTS

CONNECTORS, CABLES AND THEORY

All input and output XLR connectors are 3-wire differentially balanced. These have 3

connector pins: pin 1 = ground (cable screen), pin 2 = signal +ve, pin 3 = signal -ve

All the master output jack connectors are 3-wire balanced. These have 3 connector pins: tip

= signal +ve, ring = signal -ve, sleeve = ground (cable screen).

Avoid reversing +ve and -ve 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.

For live work 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. Refer to the following

diagram for unbalanced to balanced connections.

DEALING WITH GROUND LOOPS, BUZZ AND INTERFERENCE

For optimum performance all audio signals should be referenced to a solid, noise-free earth

point, frequently referred to as the ‘star point’ or ‘clean earth’.

A ground loop is created when the signal has more than one path to ground (earth). Should

you experience hum or buzz caused by ground loops, check first that each piece of

equipment has its own separate path to ground. If so, operate ground lift switches on

connected equipment in accordance with the instruction manuals. Alternatively disconnect

the cable screen at the destination end.

To avoid interference pickup keep audio cables away from mains power units and cables,

thyristor dimmer units or computer equipment. Where this cannot be avoided, cross the

cables at right angles to minimise interference.

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. Do not

connect to both at the same time. 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.

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Allenheath WZ14-4-2 User Manual Page 10