Planet Audio BB15D 15-Inch 1800 Watts 4-OHM Dual Voice Coils Max Power Handling DVC Subwoofer (Discontinued by Manufacturer) Power Handling (Peak) 1800W , Power Handling (Contin.) 900W , Freq. Response 12Hz- 350Hz , Efficiency (1 Watt/1 Meter) 97Db , Impedance Dual 4 Ohm , Magnet Structure 150 Oz. , Voice Coil Former 3-Inch , Mounting Depth 8-13/16-Inch Diecast Aluminum Basket Non-Pressed Paper Cone 7-Layer High Density, Fat Rolled Foam Surround Dual Flat Spiders With Woven Tinsel Leads Black Anodized Aluminum Voice Coil Former Insulated Lead Wires Exclusive Para-Term Connection System 15-Inch Dual Voice Coil Subwoofer