Ground Sound
Passive Cardioid Technology | Fulcrum Acoustic
Constant directivity speakers (DSP) for DIYers | Page 2 | Audio Science Review (ASR) Forum
Gainphile
Constant directivity speakers (DSP) for DIYers | Page 2 | Audio Science Review (ASR) Forum
So I built an 18" sealed subwoofer. Build guide and bonus picture in album! More info in comments. : r/DIY
How to Set Up a Subwoofer for Maximum Punch | PreSonus
Passive Cardioid Technology | Fulcrum Acoustic
Cardioid project: DIY waveguide and passive cardioid midbass | AVS Forum
How to Correctly Place a Subwoofer in a Room - Live Sound
Subwoofer Arrays
Fulcrum Launches Cardioid Subwoofer Product Line - Sound Forums | Sound Forums
DIY Parabolic Microphone Setup Using an Old Satellite Dish | The Chris Alan
Advanced Subwoofer Techniques - Sound Forums | Sound Forums
Sealed Cardioid Sub-Bass Loudspeakers | Professional Audio Technology | Innovox
Make Your Sub Directional For Free | diyAudio
Understanding 2-Element Cardioid Subwoofer Arrays : r/livesound
How to Set Up a Subwoofer for Maximum Punch | PreSonus
Sigberg Audio MANTA dual cardioid active speaker development thread | Audioholics Home Theater Forums
Full range cardioid | diyAudio
Mannsize. 3.5way active cardioid´ish | diyAudio
V8 Dual 10 Inch Top Speaker V-Sub 18"+12" Sub Speaker Line Array System, PA Audio Cardioid Subwoofer, Column Professional Line Array Speaker - China Line Array System and Line Array Speaker price
Sealed Cardioid Sub-Bass Loudspeakers | Professional Audio Technology | Innovox
AudioShark Forums
Setting Up A Cardioid Subwoofer System: Example 2 - ProSoundWeb
