Features Rockville RVW1800P8 1800 Watt 18 Raw DJ 8 Ohm Subwoofer Power Rating Peak Power 1800 Watts Power RMS 900 Watts Kevlar Reinforced Ultra Stiff Paper Composite Cone Pulp Composite Dust Cap Expanded and Rolled Steel Basket Treated Accordion Cloth Surround Ultra Saturated, High BL Magnetic Motor Gap 3 High Temperature 4-Layer CCAW High SPL Voice Coil Linear Progressive Conex Dual Spider System Nickel Plated Banana Plug Terminals Impedance 8 Ohms 107 oz. Magnet Motor Structure Mounting Depth 7.36 inches Frequency Response 20 Hz to 500 Hz Sensitivity 105dB @ 1w/1m REVC 6.8 Ohm FO 30.823 Hz SD 128.825m M BL 20.898 TM QMS 4.866 QES 0.517 QTS 0.468 NO 2.005% SPLO 105 dB VAS 366.294 m M CMS 155.432 uM/N MMS 171.533 g MMD 144.946 Kg. Rockville RVW1800P8 1800 Watt 18" Raw DJ 8 Ohm Subwoofer Power Rating Peak Power 1800 Watts Power RMS 900 Watts. Kevlar Reinforced Ultra Stiff Paper Composite Cone. Pulp Composite Dust Cap. Expanded and Rolled Steel Basket. Treated Accordion Cloth Surround. Ultra Saturated, High BL Magnetic Motor Gap. 3" High Temperature 4-Layer CCAW High SPL Voice Coil. Linear Progressive Conex Dual Spider System. Nickel Plated Banana Plug Terminals. Impedance 8 Ohms. 107 oz. Magnet Motor Structure. Mounting Depth 7.36" inches. Frequency Response 20 Hz to 500 Hz. Sensitivity 105dB @ 1w/1m. REVC 6.8 Ohm. FO 30.823 Hz. SD 128.825m M. BL 20.898 TM. QMS 4.866. QES 0.517. QTS 0.468. NO 2.005%. SPLO 105 dB. VAS 366.294 m M. CMS 155.432 uM/N. MMS 171.533 g. MMD 144.946 Kg.