FEATURES New Retone pd1890 TAIWAN paper cone Double spiders Stable, reliable and durable PD1890 is suitable for subwoofer. It is designed for high output low frequency subwoofer with powerful, deep and punchy bass. It is very applied to ground stack applications and packed together with full range speakers or line array GENERAL SPECIFICATIONS Nominal diameter 457 mm/18inch Power rating / 3000 to 4000 watts max Sensitive 96dB Frequency Range 40-2000Hz Chassis type Cast aluminium Magnate : Ferrite Magnate size :300x170x30mm Magnate weight: 6.8 kg/240oz Voice coil Diameter:152 mm/6in Number of layers 2inside / 2 outside Former material glass fiber Cone material : paper Surround material: cloth Spider: Double X-max: 6.5 mm Gap depth: 13 mm Voice coil winding width:26 mm Net Weight:25.5