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For good cancellation behind inline cardioid subwoofer arrays like end-fire and gradient, it's mission critical that the subwoofers have matched levels. But how does the physical displacement between the subwoofers affect the array's performance over distance?
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Prof. John VanderkooyIn 2010 Prof. John Vanderkooy presented an AES paper offering analytical proof and compelling evidence that the acoustic center for low frequencies resides in front of the loudspeaker at a distance of approximately two-thirds of the baffle radius.
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"If a battle can't be won, don't fight it"
- Sun Tzu -
Whenever we experience too much of a particular frequency or frequency range, we're tempted to resort to equalization to resolve the situation. In this article I will demonstrate that the effectiveness of EQ relies entirely on the relative level separation from other sources.
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In part II of this series of articles I will elaborate on my preliminary findings about the possibly beneficial effect of introducing gaps between adjacent enclosures in cardioid stacks and arrays.
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A short time ago I was very fortunate to have gained access to a former air force base featuring ample real estate with a solid underground.
An ideal environment for subwoofer measurements where I got to measure all typical inverted stack cardioid setups.
And while I’m still in the middle of processing all data, I would already like to share one preliminary but potentially interesting observation.