RCF NX 915-A Powered Speaker. The NX 915-A is expertly developed from the bottom up to provide outstanding audio performance for DJs, bands, and solo performers. A constant directivity waveguide, 1.75" compression driver, 15" woofer, two-channel 2100W amplifier, and coherent 100° x 60° coverage of the listening area are used to generate distortion-free sound at up to 131 dB SPL. The NX 915-A combines great performance and dependability in a small package and may be used as a stand-alone speaker for FOH systems, satellite (with subwoofer), stage monitor, or flying speaker. The NX 9 Series speakers from RCF are precisely adjusted for each model, giving unmatched clarity and a deep, potent bass response. They do this by combining their unique FiRPHASE and Bass Motion Control DSP processing.