NAMM SHOW 2017: QSC K Cardioid Subwoofer Dual 12-inch Active Subwoofer
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10 CSA stage + audience controlled left/right eight-unit cardioid... | Download Scientific Diagram
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Do-It-Yourself Cardioid Sub
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BC543 - Alcons Audio
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Martin Audio SXC115 Compact 15" Cardioid Subwoofer System. Ground-Stack Version | Full Compass Systems
