Impedance: 8 Ohm Dimension: Ø 165 mm P. RMS: 40 W P. Max: 120 W SPL (1W/1m): 90 F reson.: 55 Hz F final: 6000 Hz R (DC): 7,84 Ohm Voice Coil: Ø 25 mm Voice Coil Mat.: ALUM Magnet: Ø 90 mm Magnet weight: 450 g Total weight: 1.000 g Zo (Zmax at Fo): 38,92 Ohm Sd (Piston*Area): 0,01 sqM BL (Flux*length): 5,78 TM No (Ref Effncy): 0,39 % Qms (Mech): 3,77 Q Qes (Elec): 0,9535 Q Qts (Total): 0,7611 Q VAS (Ac.Vol): 17,07 L Cms(compl.): 642,66 M/N Mms (Total Mass): 10,62 g Mmd (Diaph. Mass): 9,70g Added Mass Cone: 7,80 g