Input Connections - Martin Audio EMX2A User Manual

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Table Of Contents

Table of Contents

CONTENTS

To change the mains voltage, remove the rectangular fuse cap and replace

it so that the correct voltage is indicated by the arrow on the body of the

rectangle. The earth terminal on the IEC connector is permanently

connected to the metal casing. The unit is supplied with the 0V electronic

reference ground taken to the case via an internal 'signal ground' lead and

space receptacle, which inserts a ground lift resistor when in the 'Earth Off'

position. To connect the 0V electronic reference direct to the chassis

ground, use a pair of pliers to pull off the space receptacle from the 'Earth

Off' position and push it onto the 0V spade terminal (marked Earth On, on

the PCB).

EMX2A inputs are on female XLR type connectors and are electronically

balanced. Pin 1 is normally open circuit but may be linked to sig 0V or

chassis earth by inserting a link on the PCB. The signal is always applied

between Pin 2 (hot +) and Pin 3 (cold -).

Always use 2-core + screen 'balanced' type signal leads, even for

unbalanced circuits. The screen should be regarded as separate from the

signal return, even if they are connected together at one end of the line.

For either balanced or unbalanced operation, always connect the signal

between Pins 2 and 3. The input cable shield should be derived from the

equipment which is sourcing the input provided that normal safety

requirements are met (ie the mains earth is correctly connected).

Chassis

Grounded

Shield

Signal

Grounded

Shield