PowerBass XL-1244D 12" Dual 4-Ohm 400 Watt RMS Subwoofer Boasting a custom turbine style frame constructed of polycarbonate/glass fiber, this unique basket supports dual stack magnets and a extended dome backplate. They utilize a combination of perimeter and pole venting to keep air circulating over the voice coil so everything stays cool. A non-pressed paper cone was selected for its natural smooth bass reproduction and its ability to provide high output with low distortion even under the stress of high SPL. Finally, to make sure the power gets to the subwoofer, they used chrome push terminals for maximum current transfer. Features - • NEW Large Roll Santoprene® Surround • 12" Dual 4-Ohm Subwoofer • 400 watt RMS/800 Watts Max • Proprietary Non-pressed Paper DDC Coated Cone • 2.0" Vented BASV Voice Coil Former • Perimeter Aero-Vent Voice Coil Cooling Vents • Proprietary Non Resonance Polycarbonate/Glass Fiber Basket • Chrome Push Terminals • Optimally Designed for Both Small Sealed or Ported Enclosures Specifications - • Nominal Impedance: 4-ohm • BL: 14.38 • Inputs: Single Coil • Subwoofer Frequency Range: 26 Hz - 300 Hz • Voice Coil Size: 2 in • Material: Non Pressed Paper • Magnet Size: 186 oz • Sensitivity (1W / 1M): 86.78 dB • Motor Structure: 186 oz • Cutout Diameter: 11 1/16" (281mm) • Mounting Depth: 5.75 in • Xmax: 8 mm • Spl: 86.78 dB • No: 0.287% • Qts: 0.421 • Qes: 0.462 • Qms: 4.794 • Mms: 172.16 g • Cms: 195 uM/N • Vas: 66.37 Ltr • SD: 490.87 sqCM • Fs: 27.5 Hz • Test Impedance: 3.21-ohm • VC Impedance: 4-ohm • Size: 12 in • Sensitivity: 86.78 dB • Frequency Response: 26 Hz - 300 Hz • Voice Coil Size: 2 in • Power Handling (RMS/Peak): 400 / 800 watts