In a cardioid subwoofer array, phase shift is employed along with delay and equalization to control the directivity of the sound, focusing bass energy forward and minimizing it behind. Phase shifting alters the waveforms of sound signals, contributing to the cardioid pattern that reduces bass spill to unwanted areas.
CTS Technology Specialist Reference
The CTS materials on sound system design explain that phase manipulation, alongside delay, is essential for cardioid subwoofer arrays to control low-frequency dispersion effectively.
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