User manual MARTIN AUDIO EMX1A

[. . . ] 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. [. . . ] 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 EMX1A 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 EMX1A 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 EMX1A is a 2-channel system controller which is recommended for use with the Martin Audio EM passive loudspeaker systems used either fullrange or with additional Martin EM201, EM251, EM150 or EM120 sub-bass systems. In its full-range mode, the EMX1A provides full system equalisation as well as 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/4-out, 120Hz electronic crossover which provides 2 x sub-bass and 2 x full-range/high-pass outputs. All four outputs are provided with sense inputs to monitor loudspeaker voltages. Sub-bass or full-range mode of operation is selected by a push switch on the front panel of the EMX1A and indicated by front panel LED's. It is important to note that the sub-bass outputs are always present at the subbass output connector, even when full-range operation is selected for the main system. 4 Martin Audio ­ EMX1A System Controller CONTENTS < 7 > ENGLISH PRINT GUIDES SENSE INPUTS Sense Input Connections Sense Input Connections Amplifier Output EMX1A Sense Inputs 1+ 1- Variable Jumper Positions (see table on page 6) (Viewed from front of controller) Position 1 Position 2 Position 3 Position 4 INDICATES JUMPER LINK FITTED 5 Martin Audio ­ EMX1A System Controller CONTENTS < > ENGLISH PRINT GUIDES Each EMX1A output has an associated limiter which provides momentary gain reduction when that output signal level exceeds a preset threshold. [. . . ] During the warranty period Martin Audio will, at it's discretion, either repair or replace products which prove to be defective provided that the product is returned in its original packaging, shipping prepaid, to an authorised Martin Audio service agent or distributor. cannot be held responsible for defects caused by unauthorised modifications, improper use, negligence, exposure to inclement weather conditions, act of God or accident, or any use of this product that is not in accordance with the instructions provided by Martin Audio. [. . . ]