Martin Audio SXC118 Compact 18" Cardioid Subwoofer System. Ground-Stack Only | Full Compass Systems
NAMM SHOW 2017: QSC K Cardioid Subwoofer Dual 12-inch Active Subwoofer
Back to Basics: Directional Subwoofer Arrays – FOH | Front of House Magazine
What is a Cardioid Subwoofer? Why Do I Need One?
Cardioid Sub Workshop | Inline Gradient - YouTube
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.
Subwoofer Cardioid Arrays
How to correctly position multiple Subwoofers for Cardioid Deployment - Live Sound