The Peavey 1208-4 SPS BWX driver series represents a new level of power and performance for Black Widow loudspeakers. Power handling is increased by 40% over other comparable models, along with reduced distortion and higher overall sound quality. The BWX series uses a new cone that is a variation on the existing Kevlar impregnated cones used on all Black Widows and is stronger, tougher, and highly water resistant. Impedance: 4 Ohms Power capacity: 2000 W Peak 1000 W Program 500 W Continuous Sensitivity: 96.6 dB / 1 W 1 m Usable freq. range: 50 Hz ~ 3.5 kHz Cone: Kevlar impregnated cellulose Voice Coil Diameter: 4.0"/ 100 mm Voice coil material: Aluminum ribbon wire Polyimide-impregnated fiberglass former Nomex stiffener Solderless diffusion welded OFHC copper leads Net weight lb. / kg: 16 lbs. / 7.3 kg Znom (ohms) 4 Revc (ohms) 3.47 Sd (Square Meters) 0.052 BL (T/M) 14.09 Fo (Hz) 55.4 Vas (liters) 66.2 Cms (uM/N) 172.5 Mms (gm) 47.90 Qms 7.09 Qes 0.311 Qts 0.298 Xmax 2.3 Le (mH) 0.19 SPL (1W 1m) 96.6 No (%) 2.90% Vd (cu. in. / ml) 18.4 / 302 Pmax (Watts pgm.) 1000 Disp (cu. in. / ml) 109 / 1797 Size: 12"