NEXO NX242-ES4 DIGITAL CONTROLLER FOR GEO S12 Page 79/11210.2.5 DelaysMultiple NX242’s can be used on a single GEO S12 array. When changing the delay in one NX242TDcontroller that is part of a multi-controller system, take great care to have exactly the same delaysetting in all NX242 TDcontrollers that receive the same input signal (i.e. all NX242’s that are fed fromthe Left output of the mixing console should have the same delay settings). A Tangent Array is verysensitive to delay differences between sections of the array in the same line. You could experiencecoverage problems if all delays applied to a Tangent Array are not equal.Please refer to the chapter in the NX242 User Manual on setting delay for proper time alignmentbetween GEO S12 and ALPHA S2 / CD18 / GEO SUB .10.2.6 Reversed Cardioid PatternPolarity checks are often performed while the system is being set up. Keep in mind that cardioidspeakers may also require a coverage test. If you invert two outputs of the NX242, you could have themain lobe inverted and firing to the rear. It may be quite hard to detect a reversed cardioid pattern whenit involves one section of a large array.A good practice is to test the each cabinet in the array with the front speakers only. The system is thenomni-directional. Then turn on the back speaker: you should notice a massive reduction at the back,and additional level at the front.This test must be done in addition to the usual polarity test.10.2.7 Using the wrong NX242 setups for a given cabinetEach NX242 setup is tailored for a certain NEXO loudspeaker. Using the wrong setup will create safetyand quality problems. Always check that every cabinet in your system is being driven by the correctNX242 setup.10.2.8 ConnectionsTo ensure correct electronic behaviour, and to guarantee specifications and EMC performance, aNX242 must be properly wired. Always use balanced connectors with the shield connected to pin 1 onboth sides. For more wiring recommendations please refer to the application note in the NX242 manualupdate.
