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Inside Passive Cardioid Loudspeaker Technology

An approach for maintaining the directional pattern of high-powered subwoofers and loudspeakers.

Excessive rear low-frequency radiation from loudspeakers and subwoofers often presents a significant challenge to sound reinforcement practitioners. While some solutions have been devised over the years, they’ve not proven entirely effective, especially in larger applications.

The engineering team at Fulcrum Acoustic is addressing the problem with an approach called Passive Cardioid Technology. It’s a patent-pending method of maintaining a directional pattern even when the total air flow is extreme, as it is in high-powered subwoofers.

In this bonus chapter of our “Everything You Wanted To Know About Subwoofers” series, Fulcrum vice president and lead product designer Dave Gunness provides an inside look at this new and still-developing technology, focusing on:

— Producing a cardioid radiation pattern

— The roles of DSP and amplification

— Maximizing efficiency

— And more!

Presented by Fulcrum Acoustic, the “Everything You Wanted to Know About Subwoofer” series features top authors from ProSoundWeb and Live Sound International providing their insights on the evolution, designs, configurations and more of sub-bass systems for live sound reinforcement.

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