What is the relationship between speaker impedance and power?

1 Answers
Journey
07/29/25 6:39pm
The relationship between speaker impedance and power: The lower the impedance, the easier it is to drive. Power is derived by dividing the square of the voltage applied to the speaker by the impedance. When a constant voltage audio signal is input into the speaker, changing the frequency of the audio signal causes the sound pressure produced by the speaker to increase or decrease with frequency, and the phase lag also varies with frequency. Impedance of car audio speakers: Due to the low-voltage nature of automotive circuits, common car audio speakers typically have a nominal impedance of 4 ohms. The impedance of subwoofers is even lower, and it can reach 0.5 ohms through parallel connection. This is distinctly different from home audio speakers, which usually have nominal impedances of 8 ohms or 16 ohms. Impedance and power do not determine performance: Neither of these factors determines the performance of a speaker. The standard impedance of a speaker is 8 ohms, and it is important to ensure impedance matching when in use. Each amplifier has an output impedance that should match the speaker's impedance.
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