T-S Parameters Resonance frequency [fs] 55 Hz Mechanical Q factor [Qms] 3.06 Electrical Q factor [Qes] 0.56 Total Q factor [Qts] 0.48 Force factor [Bl] 4.8 Tm Mechanical resistance [Rms] 1.41 kg/s Moving mass [Mms] 12.5 g Suspension compliance [Cms] 0.67 mm/N Effective diaph. diameter [D] 6.6 mm Effective piston area [Sd] 138 cm² Equivalent volume [Vas] 17.9 l Sensitivity (2.83V/1m) 90.5 dB Ratio Bl/√Re 2.77 N/√W Ratio fs/Qts 116 Hz Electrical Data Nominal impedance [Zn] 4 Ω Minimum impedance [Zmin] 3.8 Ω Maximum impedance [Zo] 19.4 Ω DC resistance [Re] 3 Ω Voice coil inductance [Le] 0.35 mH Power Handling 100h RMS noise test (IEC 17.1) 40 W Long-term max power (IEC 17.3) - W Voice Coil and Magnet Data Voice coil diameter 32 mm Voice coil height 12 mm Voice coil layers 2 Height of gap 4 mm Linear excursion ± 4 mm Max mech. excursion ± 8 mm Unit weight 0.6 kg