RCF NX 915-SMA Professional Active Stage Monitor - 15"NX 915 SMA speaker is a stage monitor designed for sound providers, musicians, bands, and DJs. The combination of a 1. 75 compression driver, 15 woofer, two channel 2,100W amplifier, and the TRW waveguide produces coherent 100 x 70 coverage for the listening area with up to 131dB SPL of distortion free sound. Used as a stage monitor, stand alone speaker system, or satellite paired with a subwoofer, the NX 915 SMA blends high performance and