Challenger OPUS SD-300BX - user opinions

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Summary: Type: subwoofer; Size: 30 sm (12 inch.); The number of bands: 1; Rated power: 250 W; Maximum: 500 W; Sensitivity: 89 dB; Resonance Frequency (Fs): 36 Hz; Total Q factor (Qts): 0.48; Equivalent Volume (Vas): 65 l; Double winding: no; Closed box: yes; Cleat spring; ...

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