Planet audior ac15d anarchy series dual voice-coil subwoofer 15in, 2, 100 watts max 2in voice coils; 4ohm; sensitivity: 89db 1w/1m; resonant freq: 25hz; poly-injection cone and foam surround; works in 2 cu ft sealed or 2. 98 Cu ft ported enclosures; 15in; 2, 100w max; 1, 050w rms; includes owner's manual and warranty card;.