Impedance: 8 Ohm Dimension: Ø 130 mm P. RMS: 30 W P. Max: 100 W SPL (1W/1m): 87,6 dB F reson.: 65 Hz Freq: 65Hz - 7kHz R (DC): 8,1 Ohm Voice Coil: Ø 25 mm Voice Coil Mat.: ALUM Magnet: Ø 90 mm Magnet weight: 210 gr Total weight: 960 gr Zo (Zmax at Fo): 28 Ohm Sd (Piston*Area): 9.504 sqM BL (Flux*length): 3.481 TM No (Ref Effncy): 0,364 % Qms (Mech): 4.768 Q Qes (Elec): 1.895 Q Qts (Total): 1.356 Q VAS (Ac.Vol): 7.234 McuM Cms(compl.): 563.997 M/N Mms (Total Mass): 4.533 g Mmd (Diaph. Mass): 4.000 MKg Added Mass Cone: 0 g