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Kicker 47KBRW12 ReFLEX™ 12" passive radiator — big bass without a ported enclosure at Crutchfield
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Boston Acoustics SPG-TR TunableRadiator Oval passive radiator for use with Boston's SPG555 subwoofers at Crutchfield
Applied Sciences | Free Full-Text | Analysis and Application of Screens for Acoustic Impedance in a Speaker Box with a Passive Radiator to Decrease Standing-Wave Influence