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Speaker impedance is a measure of a device’s ability to resist alternating current. Impedance is inversely proportional to the current that the speaker conducts from the amplifier. If the impedance is too high for the amplifier, the volume and dynamic range will be affected. If the impedance is too low, the amplifier will fail trying to supply enough power to the speakers. To measure the speaker’s overall range, you can use a multimeter. But if you want to check more accurately, you need some specialized tools.
Steps
Quick estimate
- Some manufacturers use the actual impedance as the rated impedance on the label.
- To make sense of these frequencies, note that most bass tracks are between 90 and 200 Hz, while sub-drum bass can only reach 20 Hz. Midrange tones, including most voices and instruments other than percussion, range in frequency from 250 to 2 kHz. [1] X Research Source
- If there is only one level setting for resistance, this is an auto-ranging multimeter, which will find the appropriate range on its own.
- Excessive DC current can damage the speaker coil. This risk is quite low because most multimeters only produce a small amperage. [2] X Research Source
- Do not remove any wires directly connected to the speaker cone.
- Most loudspeakers have a nominal impedance of 4, 8, or 16 Ω. After estimating, if the impedance falls into one of these values, you can safely connect the speaker to the amplifier (unless you measure something out of the ordinary).
Make precise measurements
- If you are inexperienced or only measure at home, a measuring device connected to a computer is the right choice. The accuracy of these devices is not very high, but automatically generated graphs and data will make it easier for beginners to get started.
- Some amplifiers produce inconsistent voltages at low frequencies, which is the main cause of inaccurate measurement results. For optimal results, check the voltmeter to make sure that the voltage is stable when you adjust the frequency with a sine wave generator.
- Use a good multimeter if possible. Low-cost models often give inaccurate results in this test. You can also buy high-quality multimeter probe leads at electronics stores. [4] X Research Source www.sbacoustics.com/index.php/download_file/-/view/191/
- 100W amplifier: 2.7 kΩ resistor with at least 0.5 W . power
- 90W amplifier: 2.4 kΩ resistor with at least 0.5 W . power
- 65W amplifier: 2.2 kΩ resistor with at least 0.5 W . power
- 50W amplifier: 1.8 kΩ resistor with at least 0.5 W . power
- 40W amplifier: 1.6 kΩ resistor with at least 0.25 W . power
- 30W amplifier: 1.5 kΩ resistor with at least 0.25 W . power
- 20W amplifier: 1.2 kΩ resistor with at least 0.25 W . power
- For example, if the resistor is 1230 Ω and the power source has a voltage of 10 V, we have a current I = 10/1230 = 1/123 amperes (A). You can keep fractions as they are to avoid rounding errors.
- You can use an oscilloscope instead of a voltmeter. Then find the voltage with the highest amplitude.
- For example, if I = 1/123 A and the voltmeter measures 0.05 V (or 50 mV) then Z = (0.05) / (1/123) = 6.15 Ω.
Things you need
Quick estimate
- Loudspeaker
- Digital multimeter
Make precise measurements
- Loudspeaker
- Digital multimeter
- Sine wave generator
- Amplifiers
- Resistor
- Oscilloscope (optional)
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 4,000 times.
Speaker impedance is a measure of a device’s ability to resist alternating current. Impedance is inversely proportional to the current that the speaker conducts from the amplifier. If the impedance is too high for the amplifier, the volume and dynamic range will be affected. If the impedance is too low, the amplifier will fail trying to supply enough power to the speakers. To measure the speaker’s overall range, you can use a multimeter. But if you want to check more accurately, you need some specialized tools.
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