While most of us worry about what's coming out of the front of our monitor speakers, we think less often about how much sound is being transmitted from the back. This leakage or radiation of sound can not only colour or affect mixing decisons, but in live sound setups it can also make for an uncomfortable mush of sound on the stage which is a problem for performers. But Fulcrum Acoustic thinks it may have the solution, with a new patent for its "Passive Cardioid Speaker" system. Here's what they had to say about it.
Rochester, NY & Whitinsville, MA - January 2019. Fulcrum Acoustic, LLC has been awarded a U.S. patent on a proprietary technology developed to overcome the excessive rear low frequency radiation that is a major performance challenge of many loudspeakers. The new patent, formally titled "Passive Cardioid Speaker,
No. 10,123,111 B2", was granted to inventor David W. Gunness, Fulcrum Acoustic co-founder and vice president of R&D.
The award document outlines how the patented loudspeaker's subcardioid behavior is produced by a meticulously conceived acoustical circuit which balances the position of the low frequency driver, the enclosure depth and volume, and a unique arrangement of acoustical elements including rear-mounted ports and calibrated resistive elements.
Passive cardioid technology achieves impressive directional control mechanically within the enclosure in less than half the space required for active cardioid array systems. This allows for cardioid performance in applications that might not otherwise have the budget or space to accommodate an active cardioid array. Our single-amplified, full-range passive cardioid speakers also deliver system cost benefits over traditional bi-amplified active cardioid speaker arrays by enabling up to eight speakers to be driven by a single amplifier channel.
"Our game-changing Passive Cardioid Technology eliminates excessive rear LF radiation without the extra cost, space requirements and inconvenience of active cardioid systems – with a single passive cardioidspeaker doing the work of an active cardioid array. Fulcrum passive cardioid speakers produce high sound pressure in the forward direction and consistent attenuation in the rearward direction without additional amplifiers, drivers and signal processors.
We see passive cardioid loudspeakers as a game-changing technology for the pro audio industry," states Gunness. "They enable impressive directional control in less than half the space required for active cardioid arrays. This allows for cardioid performance in applications that might not otherwise have the budget or space to accommodate an active cardioid array."
Read more about the technology: https://www.fulcrum-acoustic.com/technologies/passive-cardioid-technology.html
Learn more about acoustics and sound: https://ask.audio/academy?nleloc=category/audio/topic/audioconcepts