SPECIFICATIONS:
DC resistance (Rdc):
3,2 Ω
Nominal impedance (ZN):
4 Ω
Resonance frequency (fs):
26,3 Hz
Voice coil diameter:
2,5 inch
Mechanical Q factor (Qms):
6,03
Electrical Q factor (Qes):
0,43
Total Q factor (Qts):
0,4
Moving mass (Mms):
143,8 g
Effective piston area (Sd):
490 cm²
Mechanical resistance (Rms):
3,9 kg/s 
Compliance (Cms):
0,26 mm/N 
Force factor (BL):
12,8 Tm 
Equivalent air volume (Vas):
105,5 dm³
SPL 2,83V/1m:
91,3 dB