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Impedance and power ratings
Speaker impedance varies with frequency; its nominal value summarizes a design category rather than a constant resistor. An amplifier must support the connected load according to its specification.
Power ratings require conditions: load, distortion, number of channels and measurement method. A peak marketing number is not automatically comparable to continuous output. Low impedance can overload an unsuitable amplifier.
Worked example
Two nominal 8 Ω speakers in parallel are approximately a nominal 4 Ω load for planning, but the actual impedance varies with frequency.
Try it yourself
Compare two specification sheets and write the conditions under which their power values are measured.
Check your understanding
Can a speaker’s nominal impedance be treated as constant at every frequency?
Loudspeakers are frequency-dependent loads.
References and further reading
Lessons and examples are original introductory material. These references offer further study; their material is not included as a copied course.
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