The JRX212 monitor features a 12" low-frequency speaker and a 1" compression driver with a polymer diaphragm for high performance and system reliability. The high-frequency driver uses a Progressive Transition high-frequency waveguide to provide clearer sound with less interference. The crossover network uses heavy-duty components to allow high power levels and deliver a clear, coherent sound. JBL's SonicGuard technology protects the high-frequency driver from damage caused by excessive sound levels.