Rockford Fosgate T1S1-12 Power 12" T1 Slim Single 1-Ohm Subwoofer Features: Power Handling: 600W RMS / 1200W Max, Carbon fiber/PMI/glass fiber cone with aluminum dustcap, Injection molded foam surround with VAST, Dual Nomex progressive spiders with integrated lead wires, Aluminum diecast frame with integrated heat sink fins, Custom insulated push spring 10 AWG terminals, Dual wound 2.5" voice coil with interior/exterior windings, Encapsulating voice coil to former coupling technology (patent pending), Detachable die cast aluminum trim ring, Vented pole piece, Specifications: Voice Coil Diameter: 2.98", Speaker Connector: 10 AWG, Nominal Impedance: 1-Ohm, SPL: 84 dB, Fs: 37 Hz, Le: 0.31 mH, Sd: 560 cm2, Qts: 1.06, Qes: 1.17, Re: 1.7 Ohm, Vas: 32.4 L, Xmax: 15mm, Woofer Displacement: 0.042 cu. ft. (1.2 L), Sealed Box Volume: 1.1 cu. ft. (31.1 L), Vented Box Volume: 2.0 cu. ft. (56.6 L), Cutout Diameter: 11.22", and Mounting Depth: 3.01"