Great explanation MN.
And for cases when you have speakers of differing impedances the formulas for the total impedance is:
serial connection: r = r1 + r2 + r3 +...
parallel connection: 1/r = 1/r1 + 1/r2 + 1/r3 + ...
By combining these two formulas you can calculate the total impedance of any complex circuit of speakers (resistors).
Z.
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