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KS212C Active Dual 12-inch Cardioid Subwoofer
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BC543 - Alcons Audio
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What is a Cardioid Subwoofer? Why Do I Need One?
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Back to Basics: Directional Subwoofer Arrays – FOH | Front of House Magazine
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SXC118 | Compact, High Performance Cardioid Subwoofer
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QSC KS212C - K Cardioid Subwoofer @ The DJ Hookup
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