* 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. * Ferro-fluid cooled compression driver with titanium diaphragm 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™ highfrequency 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. Power Rating : 500 W / 2000 W Frequency Range : 36 Hz - 16 kHz (-10 dB) Dimensions (H x W x D) : 1099 mm x 464 mm x 432 mm (43.25 in x 18.25 in x 17 in) Frequency Response : 45 Hz - 12 kHz (±3 dB) Sensitivity : 100 dB SPL (1w/1m) Nominal Impedance : 4 ohms Recommended Amplifier Power : 500 W to 1000 W into 4 ohms Maximum SPL : 133 dB Nominal Dispersion : 90º x 50º Crossover Frequency : 2 kHz Weight : 42.6 kg (94 lb) High Frequency Driver : JBL 2412 1 in exit compression driver mounted on Progressive Transition™ Waveguide Low Frequency Driver : JBL M128 x 2 Input Connectors : Neutrik® Speakon® NL-4 (x1); .25 in TS phone jack (x1); parallel