"Features * 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. The reduction in mid-range phase cancellation greatly improves midrange sound quality and coverage. * 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. * The rugged, acoustically superior enclosure is constructed from 19 mm (.75 in) MDF (Medium Density Fiberboard) using advanced adhesives and mechanical fastener technology for extreme durability and improved low-frequency performance. * SonicGuard" protects the highfrequency driver from excess power without interrupting the performance. * Non-resonant, all-steel handles are used. * Attractive 18-gauge perforated, steel grille protects components from damage."