I was wondering if some of the small speakers are out of phase with the rest... is that how the sound seems to be thrown across the room.... I recall when I was about 20 years younger hooking up five speakers in a line array and the second and fifth were out of phase...which resulted in an almost tight directional beam of sound...BY the way My new pas arrived yesterday... I can hear the whole room liven up when I play my guitar ...will start gigging with it immediately...
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Interesting question. The answer is mostly "no" but there's a bit of "yes" in there too.
The drivers are all driven in phase.
What you built years ago was a Bessel array, where the weightings and polarities of the five drivers are based on an equation that contains a Bessel function in the main term (of the zero'th or first order as I recall). The equation says you can get an array to have in the far field the same radiation pattern as one of the elements. The penalty is efficiency because at least two of the five drivers (again, I'm working from memory here) are out of phase with the other three.
The "yes" part is that the way the Cylindrical Radiator(tm) speaker works in the "close field" (my term) to avoid the kind of searing build up of sound level that occurs with conventional speaker is a result of the way sound from different parts of the speaker combines: obviously, it's not all constructive interference because of the height of the speaker and the wavelengths involved.
I hope this provides some insight. Good question.
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