JBL JRX212 Portable 12" 2-way Sound Reinforcement Loudspeaker System JBL 12 in low frequency driver with a 64 mm (2.5") diameter edgewound ribbon voice coil which provides more cross-sectional wire area in the voice coil gap than round wire designs, for greater efficiency and power handling JBL 2414H-C 25 mm (1 in) polymer diaphragm compression driver improves high frequency performance as well as system reliability The advanced network topology crossover design shapes frequency response and delivers coherent summation in the crossover region High-voltage capacitors and inductors with massive cores and heavy gauge wire enable the crossover network to handle high power without saturating Progressive Transition high frequency waveguide provides superior coverage control, reduced distortion, and smoother frequency response