SXC118 | Compact, High Performance Cardioid Subwoofer
KS212C Active Dual 12-inch Cardioid Subwoofer
Back to Basics: Directional Subwoofer Arrays – FOH | Front of House Magazine
Do-It-Yourself Cardioid Sub
Cardioid Subwoofers Products | Fulcrum Acoustic
Martin Audio Ltd - On #SubwooferSunday, here's 16 DSX in a broadside cardioid sub array for the recent socially distanced Gaia Summer Nights festival in Portugal with LVT Audiovisuais and MLA Compact.
How to correctly position multiple Subwoofers for Cardioid Deployment - Live Sound
Cardioid Subwoofers | Bob McCarthy's Blog
NAMM SHOW 2017: QSC K Cardioid Subwoofer Dual 12-inch Active Subwoofer