Eighteen Sound 21iD - user opinions

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Summary: Type: Subwoofer; Size: 21"; RMS Power: 1800 W; Max Power: 3600 W; Sensitivity: 94 dB; Impedance: 2?�; DC resistance: 1.3 ?�; Frequency range: 29 - 1600 Hz; Resonant frequency: 38 Hz; Total Q factor: 0.23; Suspension equivalent air volume: 143 L; Maximum linear excursion: 14 mm; ...

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