Speaker impedance calculator

Calculate the combined nominal load for two to four speakers wired entirely in series or entirely in parallel.

Combined nominal impedanceEnter values to calculate

Series adds; parallel adds reciprocals

Series impedance is the sum of the speaker ratings. For parallel wiring, add one divided by each impedance, then take the reciprocal of that total.

Nominal impedance is not constant

A real loudspeaker’s impedance changes with frequency. This arithmetic uses the nominal labels and does not model crossover networks, mixed series-parallel wiring or the impedance curve.

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