[PLAN] SSP218 Modified Subwoofer 

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30Hz - 100 Hz
Use any B&C Speaker 18DS115 Subwoofer or any subwoofer that has the same TS parameters with this.
Resonant frequency fS 30 Hz
Electrical Q QES 0.18
Mechanical Q QMS 4.75
Total Q factor QTS 0.17
Suspension equivalent air volume VAS 177 litres
DC resistance RE 3.3 Ω
Minimum impedance Zmin 4.5 Ω
Voice coil inductance LE 2.8 mH
Force factor B·l 34 T·m
Suspension mechanical resistance RMS 13.8 N·s/m
Suspension mechanical compliance CMS 85 µm/N
Moving mass MMD 318.8 g
Moving mass (including airload) MMS 348 g
Surface of the diaphragm SD 1210 cm²
Effective diaphragm diameter Ø 39.3 cm
Maximum linear excursion Xmax ± 16.5 mm
Displacement volume at Xmax VD 1996.5 cm³
Efficiency η₀ 2.3 %
Efficiency bandwidth product EBP 166