Manual Allen-Heath MixWizard Series WZ20S (page 12 of 32) (English)

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12 WZ20S User Guide

Plugging Up The System

The MixWizard WZ20S uses professional grade 3 pin XLR, 1/4" TRS jack and RCA

PHONO sockets. 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. The following mating plugs may be used to connect audio signals

to the console:

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

connector pins: Pin 1 = ground (screen), Pin 2 = signal hot (+), Pin 3 = signal cold (-).

All the jack sockets are the 3 pole TRS type. These are wired to work with both the

balanced TRS or the unbalanced 2 pole TS type plugs. The sockets have 3 connector

pins: Inputs and outputs are Tip = signal hot (+), Ring = signal cold (-), Sleeve = ground

(screen). Insert connections are Tip = send, Ring = return, Sleeve = ground.

The RCA phono connectors are the 2 wire unbalanced type typical of those found on

domestic or semi-professional equipment such as CD players.

Avoid reversing + and - on balanced connections as this will result in out of phase signals

(reverse polarity) which may cause signal cancellation effects.

For live work where long cables runs are required, balanced interconnections should be

used. However, interconnections between more affordable 2-wire (signal, ground)

unbalanced equipment and the console are unlikely to cause problems if the cables are

kept short. 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

ground (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. 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 only. This breaks the offending loop while still maintaining

the screening down the length of the cable.

WARNING For your safety do not remove the ground (earth) connection in the

power lead of the console or connected equipment.

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.

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Allen-Heath MixWizard Series WZ20S Manual

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