Introduction： In the production, maintenance, purchase of speakers, pay special attention to the positive and negative poles of the speaker. When assembling a speaker, if the "+ -" pole is reversed, the speaker will produce phase distortion.
  OFweek electronic engineering network, in the production, maintenance, purchase of speakers, pay special attention to the positive and negative poles of the speaker. When assembling a speaker, if the "+ -" pole is reversed, the speaker will produce phase distortion.

Four methods for identifying loudspeaker polarity
  In the maintenance of speakers and speakers, it is often seen that the logo of speaker manufacturers at home and abroad is inconsistent. Here are four ways to identify loudspeaker polarity. One is to use the 1.5V battery to touch the "+, -" end of the speaker, the paper basin of the low-frequency speaker is pushed up and down, and the paper basin or shock film of the high-frequency speaker is pushed down些。
  The "+" pole of the battery is connected to the "+" end of the speaker. When the paper basin or diaphragm is pushed upward, the end touched by the "+" pole of the battery is the "+" pole of the speaker. The second is to use the pointer type multimeter to touch the "+, -" pole of the speaker, the paper basin is pushed upward, the end of the red pen is the "-" pole of the speaker, and the end of the black watch pen is the "+" pole of the speaker. Third, in the repair and assembly of the acoustic device, the polarity of the voice coil can be judged from the winding direction, as shown in the figure.

  It is wound in a clockwise direction with a "+" pole at the head and a "-" pole at the tail. It is wound counterclockwise, with the head as the "-" pole and the tail as the "+" pole. Fourth, the DC 50μA gauge of the pointer multimeter is placed in the "+" and "-" poles of the speaker, press the paper basin of the speaker, and when the multimeter pointer is swung clockwise, the end of the red pen is the "-" pole, and the end of the black pen is the "+" pole. When the hands of a multimeter move counterclockwise, the end connected to the red pen is the + pole, and the end connected to the black pen is the - pole.