Material
Cone: Paper
Spider: Nomex
Surround: Foam
Coil former: Aluminum
Basket: Aluminum
Dust Cap: PP

Specifications
DC resistance (Rdc): 3,33 Ω
Nominal impedance (ZN): 4 Ω
Resonance frequency (fs): 54,9 Hz
Voice coil diameter: 50 mm
Mechanical Q factor (Qms): 5,59
Electrical Q factor (Qes): 0,70
Total Q factor (Qts): 0,62
Moving mass (Mms): 62,3 g
Effective piston area (Sd): 143 cm²
Mechanical resistance (Rms): 3,85 kg/s
Compliance (Cms): 135 mm/N
Force factor (BL): 10,1 Tm
Equivalent air volume (Vas): 3,88 cm³
Efficiency (η): 0,33 %
SPL 2,83V/1m: 85,4 dB