Features – High quality coax speaker with coated paper cone – Resonance free steel basket – Rubber surround – Superdome tweeter with 6 dB crossover Technical data ModelG: ZCS 8.7CX Type: 2 Way coax Diameter of midwoofer or midrange: 87 mm / 3.50 Mounting diameter of midwoofer or midrange: 80 mm / 3.15 Mounting depth of midwoofer or midrange: 43 mm / 1.69 Voice coil of midwoofer or midrange: 19 mm / 0.79 Cone of midwoofer or midrange: Coated paper Basket of midwoofer or midrange: Steel Magnet of midwoofer or midrangeFerrit Voice coil of tweeter: 13 mm / 0.51 Cone of tweeter: Superdome Housing of tweeter: ABS Magnet of tweeter: Neodym Power handling WRMS: 50 W Power handling W peak: 90 W Impedance: 4 Ohm SPL: 88 dB Frequency response: 100 – 20000 Hz.