SPG555-2 - Boston Acoustics 13" 1000 Watt SPG Series Car Subwoofer Power Handling: RMS: 1000 watts Impedance: 2 Ohms Polypropylene Woofer Foam surround Radialvent cooling technology RVC (Removable Voice Coil) allows coil to be exchanged without removing the woofer from the enclosure SPS (Soft Part System) removable assembly enables field repair of the cone/surround/spider assembly SPG555 can be field-stripped and custom painted, powder-coated, or plated for a custom lookSimplified mounting with the integral sealing gaskets 3-1/2" Voice coil Frequency response: 20-350 Hz Sensitivity: 87.7 dB at 2.83V 83.6 dB at 1.0V