RCF NX 15-SMA Active Coaxial Stage Monitor The RCFNX 15-SMA is equipped with new high power 700 W digital amplifier anda newly designed 15” coaxial neodymium transducer that guarantees outstandingaudio quality and definition as well as an extremely lightweight of the finalsystem. The NX 15-SMA can be also used as a portable PA system thanks to the ruggedpowder coated steel pole mount installed on the side. In order to control theresponse of the speaker in such different applications RCF has incorporatedtwo special Equalization Modes: