Page 80/112 SYSTEM ALIGNMENT GUIDELINES11 SYSTEM ALIGNMENT GUIDELINESThe NX242’s factory delay presets are optimised to provide the best possible crossover between theGEO S12 and CD18 / S2 / GEO SUB systems. The reference point for this adjustment is the front ofeach cabinet. (This means that the internal delays needed to achieve a correct time alignment are setfor cabinets standing next to each other with both fronts aligned). We recommend that the system isadjusted so that arrivals from GEO S12 and CD18 / S2 / GEO SUB are coincident at a fairly distantlistening position.11.1 GEO S12 Vertical Cluster designCluster design must be done with Geosoft2, which provides very intuitive and fast method to determineall cluster geometry parameters in relation to venue where cluster is implemented.IMPORTANTGeosoft2 is a freeware downloadable on www.nexo-sa.com. Please check our websiteperiodically for upgrades.Never install a GEO S12 cluster without checking its acoustical performances andmechanical safety in Geosoft2 prior to installation.Please contact your local distributor for assistance and/or training on Geosoft211.2 Stacked RS15 / CD18 / S2 / GEO SUB and Flown GEO S12Recommended NX242 GEOS12 setup family: X-OVERIn the example below, r1 being the distance from GEO S12 array to listener position, and r2 being thedistance from GEO SUB to listener position, the distance difference is then r1–r2 (specified meters orfeet).• r1 > r2, the delay should be set on the CD18 / S2 / GEO SUB NX242 TDcontroller channel.• r1 < r2, the delay should be set on the GEO S12 NX242 TDcontroller channel• To convert the result in time delay (specified in seconds), apply:• ∆t = (r1-r2)/Cr1 and r2 in meters, C (sound speed) ≈ 343 m/S.The delay parameter is set in MENU 1.2 (set the units to meters, feet or seconds according to yourpreference). Delay will have to be adjusted according to the distance difference r1–r2 (see figure below).r1r2
