Impedance: 8 Ohm Dimension: Ø 250 mm P. RMS: 90 W P. Max: 180 W SPL (1W/1m): 87,1 F reson.: 35 Hz Freq: 40 Hz ... 5 kHz R (DC): 7,8 Ohm Voice Coil: Ø 38 mm Voice Coil Mat.: ALUM Magnet: Ø 120 mm Magnet weight: 840 g Total weight: 2.500 g Zo (Zmax at Fo): 36 Ohm BL (Flux*length): 9,4 TM No (Ref Effncy): 0,32 % Qms (Mech): 3,14 Q Qes (Elec): 0,86 Q Qts (Total): 0,67 Q VAS (Ac.Vol): 63 L Cms(compl.): 0,46 M/N Mms (Total Mass): 43,3 g Added Mass Cone: 7 g