How to Detect the Quality of a Speaker with an Analog Multimeter
Set the analog multimeter to the ohm range and then select the 1 - ohm scale. Short - circuit the red and black test leads of the analog multimeter and adjust the zero point to ensure accurate measurement. When measuring a speaker, there's no need to zero - adjust the meter. Simply set the multimeter to the 1 - ohm scale. You can randomly connect one test lead to either the positive or negative terminal of the speaker. Then, use the other test lead to briefly touch the other terminal of the speaker. If you hear a "clicking" sound, it indicates that the speaker is in good condition. Conversely, if there is no sound, it means the speaker is faulty. The above is the method for judging the quality of a speaker using an analog multimeter. It is best to use the 1 - ohm scale of the analog multimeter for this measurement.
You can use the resistance - measuring range to test the speaker. The driver of a speaker consists of a copper - wire winding coil. According to impedance requirements, speakers can be divided into those with 4 - ohm, 8 - ohm impedance, etc. As long as current can pass through, the speaker is good. This is the knowledge I learned 55 years ago. At that time, I assembled a seven - tube transistor radio by myself and repaired transistor televisions. Nowadays, integrated circuit chips are widely used, and knowledge has been updated, but the principle of speakers hasn't changed much.
