The pin polarity of the speaker is relative, as long as the polarity of each speaker used in the same room is the same.
For more than one speaker, for this reason, it is necessary to distinguish the polarity of each speaker pin: when two speakers are not connected in series or in parallel with the same polarity, the current flowing through the two speakers is different, one from the voice coil The head flows in and one flows in from the tail of the voice coil, so that when the cone of one speaker vibrates forward, the cone of the other speaker vibrates backwards, and the vibrations of the two speaker cones are opposite in phase, and some of the air vibrates. The energy is offset. Therefore, when more than one speaker is required to be used in the same room, the same polarity is connected in series or in parallel so that the directions of the vibrations of the respective paper cones are the same.
Some of the wiring brackets on the back of the speaker have been marked with the "+" "-" symbol to indicate the positive and negative polarity of the two leads, which can be directly identified.
The pin polarity of the speaker can be determined by audio-visual discrimination. The two pins of the two speakers are connected in parallel at any point, connected to the output of the power amplifier, and the two speakers are fed with electrical signals, and the two speakers simultaneously emit sound.
The two speakers are close to each other. If the sound is getting smaller and smaller, the two speakers are connected in reverse polarity, that is, the positive pole of one speaker is connected in parallel with the negative pole of the other speaker.
The principle of the above identification method is: when the two speakers are connected in parallel, the cone of one speaker moves inward, and the cone of the other speaker moves outward, and the sound pressure between the mouth and the mouth of the two speakers is reduced. Small, so the sound is low. When the two speakers approach each other, the sound pressure between the two speakers is smaller, so the sound is smaller.