Nexo NXAMP4X1 User Manual

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Nexo NXAMP4X1 User Manual Manual pdf 48 page image

INSTALLATION RECOMMENDATIONSWe recommend that the system is adjusted so that arrivals from MAIN SYSTEM array andSUB speakers are coincident at a fairly distant listening position (typically further than themixing position).Geometrical alignmentIn the example below, r1 being the smaller distance from MAIN SYSTEM array to listenerposition, and r2 being the smaller distance from SUB to listener position, the distancedifference is then r1–r2 (specified meters or feet).• r1 > r2, the delay should be set on the SUB NXAMP4x1 Powered TDcontroller(s).• r1 < r2, the delay should be set on the MAIN SYSTEM NXAMP4x1 PoweredTDcontroller(s)To convert the result in time delay (specified in seconds), apply:∆t = (r1-r2)/C r1 and r2 in meters, C (sound speed) ≈ 343 m/S.The delay parameter is set in MENU “Delay” (See above).However, it is a safe practice to double-check geometrical alignment with a properacoustical measurement tool.1200 mm[47.24"]750 mm[29.53"]750 mm[29.53"]1200 mm[47.24"]750 mm[29.53"]750 mm[29.53"]1200 mm[47.24"]750 mm[29.53"]750 mm[29.53"]r 2r1Measuring and aligning phase in the overlapping regionMicrophone must be set on the ground, at a fairly distant listening position (typicallyfurther than the mixing position).Phase must be measured with a wrapped display, and measurement must be properlywindowed on signal arriving time (same window for SUB and MAIN SYSTEM). Whenmeasurement is synchronized to the system-microphone distance, phase can be clearlydisplayed in the low-frequency range.PAGE 48 OF 80