DD Audio 9921 D2 - user opinions

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Summary: Type: Subwoofer; Size: 21"; RMS Power: 1500 W; Max Power: 2500 W; Impedance: 2x 2?�; DC resistance: 2 ?�; Resonant frequency: 33 Hz; Total Q factor: 0.46; Suspension equivalent air volume: 162 L; Maximum linear excursion: 22 mm; ...

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