Wiring a line array:
The question of how to wire the drivers in a vertical line array has been asked of me so many times I've decided to explain and show the scheme here.
First, one needs to know the nominal impedance to the drivers forming the array.   I've constructed a table to show the various combinations of drivers of standard impedance which can be put together with a final impedance acceptable to most amplifiers (5.3 to 10 ohms).
Array driver impedance combination chart:
As an example, below is the wiring schematic for a 9 driver array:
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