Nexo RS15 User Manual

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Nexo RS15 User Manual Manual pdf 34 page image

Page 34/58 GENERAL GUIDELINES FOR SUBWOOFER DESIGN7.2 Gradient Subwoofers benefitsGradient subwoofers can provide up to 15 dB front to rear averageattenuation (Please refer to Ray Sub technical note for in-detail explanationon gradient subwoofers).Low frequency level on stage is therefore significantly reduced on stage, andin the neighbouring environment in open air venues.Because of their directional pattern, Gradient subwoofer are also lesssensitive to room eigen modes.7.3 Monophonic DesignLeft and Right subwoofer arrays can be merged into a monophonic system so that interferences nolonger exist.When using few cabinets, this can be done by installing these cabinets at the centre front stage. Ifcabinets are set on the ground in front of the stage, level discrepancy from first to last rows will beimportant. Flying cabinets above centre stage will reduce first to last rows discrepancies significantly.CENTRE STACKED DIRECTIONAL SUBWOOFER CENTRE FLOWN DIRECTIONAL SUBWOOFERWhen using a larger amount of cabinets, these can then be installed all across the stage provideddistance between units does not exceed half the wavelength of the upper frequency limit (1.7m/5.6ft at100 Hz). Array coverage can then be adjusted geometrically (by curving the array horizontally so that itmatches the audience area, which creates an asymmetrical front stage to rear stage pattern with a “hot”point on stage) or electronically (by implementing a delay that increase from the centre to the sides,which creates a symmetrical pattern front to rear). In both cases, omnidirectional subwoofers should beavoided so low frequency that level on stage does not exceed level in the audience.CURVED SUBWOOFER ARRAY ACROSS STAGE STRAIGHT DELAYED SUBWOOFER ARRAY ACROSS STAGE