Impedance: 8 Ohm Dimension: Ø 250 mm P. RMS: 80 W P. Max: 200 W SPL (1W/1m): 91 F reson.: 43 Hz F final: 4.500 Hz R (DC): 7,75 Ohm Voice Coil: Ø 25 mm Voice Coil Mat.: Alum Magnet: Ø 113 mm Magnet weight: 675 g Total weight: 2.000 g Zo (Zmax at Fo): 36,18 Ohm Sd (Piston*Area): 0,03 sqM BL (Flux*length): 7,85 TM No (Ref Effncy): 0,49 % Qms (Mech): 3,72 Q Qes (Elec): 1,01 Q Qts (Total): 0,79 Q VAS (Ac.Vol): 65,84 L Cms(compl.): 460,11 M/N Mms (Total Mass): 29,90 g Mmd (Diaph. Mass): 26,65 g Added Mass Cone: 26 g