Output Connections; Modes Of Operation - Martin Audio EMX2A User Manual

System controller

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Table Of Contents

Table of Contents

CONTENTS

EMX2A outputs are electronically balanced auto compensating via male

XLR type connectors. Pin 1 is the (ground) connection and the signal

appears between Pins 2 and 3.

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.

This is to keep the screen a true screen so that no signal return currents

flow through it which can induce signals in adjacent cables.

For unbalanced use, having decided which pin is 'hot' (see above), connect

the 'cold' pin and (Pin 1) together. The internal signal ground lead should

be placed in the earth off position at the EMX2A outputs which permit the

amplifier to be locally grounded (as required for safety reasons) without

causing a hum loop. If the signal is merely taken between either Pin 2 or 3

and Pin 1, a level loss and signal degradation will occur.

For balanced operation, the screen should be connected to ground at the

amplifier end. To eliminate ground current loops, it can be lifted at the

EMX2A output, provided normal safety requirements have been met (ie the

mains earths are correctly connected).

The power ratings of amplifiers connected to EMX Series controllers should

lie within the range recommended for the EM Series loudspeaker system

being driven. Please refer to the section on amplification in the EM Series

user's guide for further information.

The EMX2A is a 2-channel system controller which is recommended for

use with the Martin Audio EM186 3-way loudspeaker system used either

full-range or within additional Martin EM201 or EM251 sub-bass systems.

In its full-range mode, the EMX2A is a 2-in/4-out device providing full

system equalisation and 650Hz electronic crossover functions to drive the

separate low and mid/high sections of bi-amplified EM186 systems. It also

features loudspeaker protection using limiters activated by the true voltages

applied to the loudspeaker.

In its sub-bass mode, it is reconfigured automatically as a 2-in/6-out 120Hz

and 650Hz electronic crossover which provides outputs for the sub-bass,

low and mid/high sections. All six outputs are provided with sense inputs to

monitor the actual loudspeaker drive voltages.

Sub-bass or full-range mode of operation is selected by a push switch on

the front panel. It is important to note that the sub-bass outputs are always

present at the sub-bass output connector, even when full-range operation is

selected for the main system.

The EMX2A full-range mode normally provides separate outputs to the low

and mid/high sections of the EM186 bi-amplified systems. For special

applications, the EMX2A low frequency outputs can be switched to full-

range by means of an internal PCB mounted slide switch.