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What is the formula to calculate how many ohms your speakers will put on a power amp?

For example two 8 ohm speakers daisey chained together

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Series connection: \$ R_{total} = R_1 + R_2 \$.

Two 8 Ω speakers in series -> 16 Ω.

Parallel connection: \$ R_{total} = \frac {R_1 \cdot R_2}{R_1 + R_2} \$.

Two 8 Ω speakers in parallel -> 4 Ω.

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