15; 3,000W max; 1,700W RMS; Blue, cast aluminum basket with diamond-cut accents; Chrome back plate; 2.5 dual 4ohm voice coils; Overcompensating motor structure for increased magnetic strength; 12mm T-yoke & top plate improve low-frequency dynamics; Vented T-yoke & frame reduces voice-coil heat buildup; Die-cast aluminum heat sink dust cap absorbs voice-coil heat; Aluminum dust cap fins dissipate heat & strengthen cone; Nonmagnetic nonresonant die-cast aluminum frame; 4-layer voice coil with large gauge wire increases power; High-temperature-tolerant adhesives resist thermal failure; Nickel-plated, 8-gauge, spring-loaded compression wire terminals; Nontransfer spruce pulp cone & high-density polyether foam surround with UV & chemical protection; Dual poly-cotton suspension dampens violent accelerations; Stitched voice coil leads prevent potential damage; Efficiency: 86.97 @ 1W/1m; Motor volume: 373oz; Mounting depth: 8.125; Optimum sealed enclosure: 2 cu ft; Optimum ported enclosure: 4 cu ft; Includes 1-piece gasket/trim ring with concealed mounting holes;