User manual MARTIN AUDIO EMX2A

[. . . ] After unpacking the unit, examine it carefully for any signs of transit damage and inform your dealer if any such damage is found. It is suggested that you retain the original packaging so that the unit can be repacked at a future date if necessary. Please note that Martin Audio and its distributors cannot accept responsibility for damage to any returned product through the use of nonapproved packaging. 3 MAINS CONNECTION The EMX2A is provided with an IEC 320 type mains receptacle. [. . . ] 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. 6 MODES OF OPERATION 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 fullrange by means of an internal PCB mounted slide switch. 4 Martin Audio ­ EMX2A System Controller ENGLISH CONTENTS < 7 > PRINT GUIDES SENSE INPUTS Sense Input Connections Sense Input Connections Amplifier Output EMX2A Sense Inputs 1+ 1- Variable Jumper Positions (see table on page 6) Position 1 Position 2 Position 3 Position 4 INDICATES JUMPER LINK FITTED 5 Martin Audio ­ EMX2A System Controller ENGLISH CONTENTS < > PRINT GUIDES Each EMX2A output has an associated limiter which provides momentary gain reduction when that output signal level exceeds a preset threshold. [. . . ] Martin Audio is not liable for consequential damages. This warranty is exclusive and no other warranty is expressed or implied. This warranty does not affect your statutory rights. 7 Martin Audio ­ EMX2A System Controller ENGLISH CONTENTS < 12 EMX2A > PRINT GUIDES TECHNICAL SPECIFICATIONS INPUTS (SIGNAL) IMPEDANCE CMRR CONNECTORS INPUTS (SENSE) IMPEDANCE CONNECTORS OUTPUTS SOURCE IMPEDANCE MIN LOAD IMPEDANCE MAX OUTPUT CONNECTORS FREQUENCY RESPONSE DISTORTION+NOISE SIGNAL+NOISE/ NOISE RATIO LIMITERS INDICATORS MAINS SUPPLY MAINS VOLTAGE 2 Electronically Balanced 36K ohms (18K ohms per leg single ended) 60dB 20Hz - 10KHz 3 Pin female XLR 6 Electronically Balanced 36K ohms Shrouded 4mm sockets 6 Electronically Balanced 47 ohms 500 ohms +20dBu into 500 ohms limiter defeated 3 Pin Male XLR -3dB @ 25Hz 12dB/octave -3dB @ 35KHz 12dB/octave 0. 01%THD @ 2V output (limiters cancelled) >97dB @ 2V output 20Hz - 20KHz quasi peak o/c input Individual for each channel. [. . . ]