Speaker Impedance Network

Formula and source

Series Z = sum of Z_i; parallel Z = 1 / sum(1/Z_i) (equal drivers = Z/N); series-parallel combines the two. Safety verdict: total impedance >= amplifier minimum rated load.

Ohm's-law series/parallel impedance combination (public); the amplifier-minimum-load check follows the manufacturer's rated minimum, by name (user-supplied).

Audience

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Posture

Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.