CT Sounds Tropo 12 Inch Free Air Car Audio Subwoofer 1500 Watt Peak Infinite Baffle Sub HIGH END CAR AUDIO FREE AIR SUBWOOFER - If you are looking for the perfect free air subwoofer, then look no further than CT Sounds Tropo 12 Inch Free Air Sub. QUALITY SOUND - If you are looking for a quality car audio infinite baffle free air subwoofer then look no further! COMPETITION GRADE - All CT Sounds products are of competition grade BUILT TO LAST - All CT Sounds products are built with durability in mind, our subwoofers hold up under the harshest conditions QUALITY DESIGN - 450 Watts RMS, 1500 Watts PEAK Power, Dual 4 Ohm Car Audio Subwoofer with Spring Terminals 1 x Tropo12&#034; Free Air D4 Car Subwoofer (Dual 4 ohm) Dual 4 (ohm) subwoofer Rated at 450W RMS | 1500W PEAK 3 (dia) voice coil makes Incorporates Y35 graded triple stacked ferrite magnet Strong, sturdy and stupendous arm styledbasket frame Quality SPL sub Subpower: <span class="a-text-bold">450W (RMS) | 1500W (MAX)</span> Subwoofersize: 12&#034; Subwoofertype/ impedance:Dual 4 ohm Voice coil (diameter): 3 / 76.2mm FS: 46.23Hz QTS: 0.394 QES: 0.425 QMS: 5.506 VAS: 34.008 liters SPL: 90.9 dB (@1w/1m) Xmax: 12mm (Single way) Displacement: 0.132 cu. ft. Speaker connector: 12 Gauge Sealed: 1.40 cu. ft. Cutout diameter: 282mm / 11.1&#034; Overall diameter: 314mm / 12.36&#034; Mounting depth: 133mm / 5.24&#034;