Speaker Ohms. How to calculate and test it.

Multiple resistors or speakers.
In series R1 + R2 + R3 ... = Rt
In parallel (1/R1) + (1/R2) + (1/R3) ... = 1/Rt
Ugly's Electrical References book
Speaker system impedance testing.
TEMNA78 6948
www.newark.com...

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Thank you, It has been very useful to me. Blessings.