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

Specifications
DC resistance (Rdc): 3,2 Ω
Nominal impedance (ZN): 4 Ω
Resonance frequency (fs): 38,8 Hz
Voice coil diameter: 2,5 Inch
Mechanical Q factor (Qms): 4,99
Electrical Q factor (Qes): 0,42
Total Q factor (Qts): 0,39
Moving mass (Mms): 98,8 g
Effective piston area (Sd): 366 cm²
Mechanical resistance (Rms): 4,8 kg/s
Compliance (Cms): 0,17 mm/N
Force factor (BL): 13,5 Tm
Equivalent air volume (Vas): 24,5 dm³
SPL 2,83V/1m: 90,1 dB