ALLEN & HEATH MixWizard WZ3 User's Guide download pdf (Page 12)

WZ16:2DX

AND

WZ12:2DX U

SER

UIDE

LUGGING

YSTEM

The

Mix Wizard

series uses professional grade 3-pin XLR, 1/4" TRS jack and RCA PHONO

sockets. The applications diagrams on page 26 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.

ONNECTOR

INOUTS

ONNECTORS

, C

ABLES AND

HEORY

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 impedance 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.

EALING WITH

ROUND

OOPS

, B

UZZ AND

NTERFERENCE

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.

ONNECTING

HANNEL

NPUTS

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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ALLEN & HEATH MixWizard WZ3 User's Guide Page 12

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