Fi Car Audio SP4 18v2+ D1 - user opinions

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Summary: Type: Subwoofer; Size: 18"; RMS Power: 3500 W; Max Power: 7000 W; Sensitivity: 89 dB; Impedance: 2x 1?�; DC resistance: 1.3 ?�; Resonant frequency: 24 Hz; Total Q factor: 0.37; Suspension equivalent air volume: 150 L; Maximum linear excursion: 33 mm; Resonant frequency: 24.6 Hz; Electrical Q: 0.39; Mechanical Q: 9.44; Suspension equivalent air volume: 149.8 L; Force factor: 17.18 T?�m; Suspension mechanical resistance: 9.4 N?�s/m; Suspension mechanical compliance: 73 ?�m/N; Moving mass: 543.2 g; Moving mass (including airload): 573 g; Surface of the diaphragm: 1210 cm??; Effective diaphragm diameter: 39.3 cm; Maximum linear excursion: ?� 33 mm; Displacement volume at Xmax: 3993 cm??; Effici ...

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