QSC KS212C Cardioid Subwoofer 2 x 12" | MUSIC STORE professional
Back to Basics: Directional Subwoofer Arrays – FOH | Front of House Magazine
Cardioid Subs - Bose Portable PA Encyclopedia
Understanding 2-Element Cardioid Subwoofer Arrays – Between The Lines
A Concise Article on Cardioid Subwoofer Arrays – by Steve Bush — Bob McCarthy
How to correctly position multiple Subwoofers for Cardioid Deployment - Live Sound
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.