RCF NXL 44-A MK2 Powered Speaker. A line array column speaker called the NXL 44-A MK2 was expertly developed from the bottom up to provide outstanding audio performance for bands, DJs, clubs and rental businesses. A 2,100W two-channel amplifier and the best-in-class RCF transducers produce coherent 100° x 25° coverage for the listening area at 135 dB SPL. Three 10" neodymium woofers and a 3" driver are mounted atop a waveguide in the two-way arrangement. The speaker can be flown, used as a stand-alone speaker, or combined with another NXL 44-A MK2 for increased coverage. It delivers an enhanced frequency range down to 45 Hz.