Features: - Impedance: 8 OhmsPower capacity: 1400 W Peak, 700 W Program, 350 W Continuous - Sensitivity: 98.9 dB / 1 W 1 m - Usable freq. range: 40 Hz ~ 2 kHz - Cone: Kevlar impregnated cellulose - Voice coil diameter: 4.0 inch / 100 mm - Voice coil material: Aluminum ribbon wire, Polyimide-impregnated fiberglass former, Nomex stiffener, Solderless diffusion welded OFHC copper leads