Dual JBL low frequency drivers with a 64 mm (2.5 in) diameter edgewound ribbon voice coil which provides more crosssectional 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 * A "Quasi 3-Way" design offers the extra bass for which a dual fifteen system is designed, but without sacrificing performance in the critical mid-range; The upper woofer produces mid-frequencies and bass, while the lower woofer concentrates on bass only * High-voltage capacitors and inductors with massive cores and heavy gauge wire enable the crossover network to handle high power without saturating