(1) When directly observing the lead frame on the back of the speaker, the polarity of the positive and negative pins is the same for the speaker produced by the same manufacturer; for the speakers produced by different manufacturers, it is not guaranteed to be consistent, and it is better to use other methods. Identification.
(2) In the process of using the multimeter to identify the pin polarity of the high-sounding speaker, since the voice coil of the high-sounding speaker is small, the deflection angle of the hand is small, and it is not easy to see, and the paper cone can be quickly pressed at this time. The hands are deflected at a larger angle. Be careful not to damage the cone when pressing the cone.