This inductance opposes the flow of electricity similar to resistance and changes with the audio frequency. Notice how the impedance rises as the frequency increases.
This due to the inductance of the voice coil. Inductive reactance impedance is directly related to the frequency. In other words, the impedance is directly proportional to the frequency, meaning it goes up or down as the frequency increases or decreases.
Also, you can see how the speaker impedance, in Ohms, is the square root of the sum of the squares of both the resistance and the inductive reactance of the speaker. Think of it as trigonometry and the way you find the hypotenuse of a triangle. However, it depends on the particular speaker. Other parameters like efficiency measured speaker output in decibels [dB] for 1 watt typically and off-axis response are usually measured at 1 kiloHertz KHz.
For some particular speakers with additional data, there might be an impedance value specified for a specified frequency. In that case, the impedance is shown as a graph over a wide range of audio frequencies. A graph comparing the power produced by 8 and 4 ohm speakers when connected to the same amplifier.
A speaker with an 8 ohm impedance consumes less power at the same output volume as a speaker with a 4 ohm impedance. The receiver may shut itself off temporarily, or you may burn up the receiver. Some amplifiers and receivers feature an impedance switch on the back that you can use to switch between ohm settings.
The problem with using this switch is that impedance is not a flat setting, it is a curve that varies. Using an impedance switch to "match" your equipment to your speakers intentionally cripples the full capabilities of your amplifier or receiver. Leave the impedance on its highest setting and buy speakers that match your equipment's impedance settings for the best performance.
In car audio, 4-ohm speakers are the norm. That's because car audio systems run on 12 volts DC instead of a volts AC. A 4-ohm impedance allows car audio speakers to pull more power from a low-voltage car audio amp. Car audio amps are designed for use with low-impedance speakers. So crank it up and enjoy. Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content. Create a personalised content profile. Measure ad performance.
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Measure content performance. Develop and improve products. List of Partners vendors. Brent Butterworth. A former Lifewire writer, Brent Butterworth's lifelong passion for audio and music has taken him from building DIY speakers to searching for the hottest new audio technologies. Updated on November 13, Michael Barton Heine Jr. Lifewire Technology Review Board Member.
Can you mix Speakers different ohms? Are higher ohm speakers better? Is 4 or 8 ohms better? What speaker ohms is the best? What amplifier do I need for 8 ohm speakers? Are 4 ohm speakers louder than 8 ohms? Is a 2 ohm speaker louder than a 4 ohm speaker? Are higher or lower ohms better? Why do ohms matter in speakers? Is more or less ohms better for subwoofers? What happens if speaker impedance is too high? Does ohms affect sound quality? Do 4 ohm speakers sound better?
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