Fi Car Audio SP4 15v2+ D2 - user opinions

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Summary: Type: Subwoofer; Size: 15"; RMS Power: 3500 W; Max Power: 7000 W; Sensitivity: 88 dB; Impedance: 2x 2О©; DC resistance: 1.3 О©; Resonant frequency: 27 Hz; Total Q factor: 0.32; Suspension equivalent air volume: 71 L; Maximum linear excursion: 33 mm; Resonant frequency: 27.5 Hz; Electrical Q: 0.33; Mechanical Q: 8.76; Force factor: 17.18 TВ·m; Suspension mechanical resistance: 8.6 NВ·s/m; Suspension mechanical compliance: 78 Вµm/N; Moving mass: 421.2 g; Moving mass (including airload): 438 g; Surface of the diaphragm: 810 cmВІ; Effective diaphragm diameter: 32.1 cm; Maximum linear excursion: В± 33 mm; Displacement volume at Xmax: 2673 cmВі; Efficiency: 0.44 %; Efficiency bandwidth product: 8 ...

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