Passive Full-Range Array Speaker, Frequency range 60-20KHz, element impedance 4 ohm, 90°Horizontal X 8°, Sensitivity  102dB, power 1800w, speakon in/out, Bass: 2x12 inch, Midrange 2x8 inch, treble 2x3inch, neodymium transducers, birch plywood with 2mm steel grill, 71kg.