The SWS800 high-power professional subwoofers were specially designed to reproduce sound at the very low end of the audio spectrum. Employing a 4" diameter, 4-layer cooper voice coil, non-pressed long fiber pulp cone, and highly reinforced aluminum injected frame, this new design is capable of handling up to 1,600 watts continuous music power. Specifications: *Power handling: 800 watts RMS/1,600 watts max *VCdia: 4" *Le: 3.87 mH *Nominal impedance: 8 ohms *Re: 5.8 ohms *Frequency response: 30-1,500 Hz *Magnet weight: 120 oz. *Fs: 32 Hz *SPL: 96 dB 1W /1m *Vas: 8.09 cu. ft. *Qms: 13.7 *Qes: 0.42 *Qts: 0.41 *Xmax: 6.5 mm *Dimensions: Overall diameter 18", Cutout diameter 16.54", Depth 8.46".