Measuring the impedance, or resistance, of a speaker can be an important skill to have when wiring car audio systems. The resistance of a speaker potentially has a big effect on the performance of amplifiers connected to the gear, and in worst-case scenarios, it's possible to damage the amplifier if the resistance of the speakers is too low. So, if you don't know the impedance of a speaker, it's a wise idea to check.
Instructions
1. Insert the probes of a digital multimeter in the correct sockets of the multimeter. There may be several different sockets for the probes depending on what parameters you're measuring. Look for the sockets marked "impedance" or displaying the ohm symbol. Different models and brands of multimeters will vary in their labeling, so check your multimeter's manual if you're not certain about which one to use.
2. Select the range for the multimeter. Since you'll be measuring fairly low resistance levels with a speaker, choose a range that will encompass readings in the 2-16 ohm range. It's extremely rare to find speakers that will have an impedance outside of that range.
3. Touch one probe to each of the speaker terminals and check the reading. This will be the impedance of the speaker. Record the measurement, and when you're done, turn off the multimeter to preserve the batteries for the next time you need the multimeter.
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