A simple system that will allow you to calculate with decibels on the back of an envelope without having to use an actual calculator.
Coherence 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 changes under certain circumstances and this article looks at one of those specific aspects which is reverberation induced by a loudspeaker based on its directional behavior.
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.
"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.