Name HG-165AeroPP-3 DC resistance Rdc 2,7 Ω Nominal impedance ZN 3 Ω Resonance frequency fs 49,5 HZ Voice coil diameter 37 mm Mechanical Q factor Qms 7,3 Electrical Q factor Qes 0,6 Total Q factor Qts 0,55 Moving mass Mms 14 g Effective piston area Sd 135 cm2 Mechanical resistance Rms 0,63 Kg/s Compliance Cms 0,71mm/N Force factor BL 4,5 Tm Equivalent air volume Vas 18 dm3 Efficiency η 0,35 % SPL 2,83V/1m 92,2 dB