If you need two parallel blocks, and each is connected in series, this is what it would look like:
(+)
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(+)------speaker-----(-)
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(+)------speaker-----(-)
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(+)------speaker-----(-)
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(+)------speaker-----(-)
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(-)------speaker-----(+)
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(-)------speaker-----(+)
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(-)------speaker-----(+)
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(-)------speaker-----(+)
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(-)
Total impedance of the array will be half the impedance of a single driver.