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Coherence and reverberationCoherence is a common feature found on many analyzers enabling us to distinguish signal from noise. It will indicate whether you're measuring a loudspeaker or, e.g., a moving light.

Coherence is subject to change. One of the aspects involved, among others, that we’ll explore in-depth, is the relationship between the direct sound of a loudspeaker in a room and the room’s reverberation.

efficiency quotes anquotes 696x374For 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?

Prof. John VanderkooyProf. 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.

Pick your battles"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.

Mind the gap - Part IIIn 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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