The main performance indicators of the speaker speaker

The main performance indicators of the speaker are: sensitivity, frequency response, rated power, rated impedance, directivity and distortion and other parameters.
1. Rated power
The power of the speaker is divided into nominal power and maximum power. The nominal power is rated power without distortion. It refers to the maximum input power of the speaker in the rated distortion-free range, and the power marked on the speaker's trademark and technical specification is the power value. Maximum power refers to the peak power that the speaker can withstand at a given moment. In order to ensure the reliability of the hoist, the maximum power of the speaker is required to be 2~3 times of the nominal power.
2. Rated impedance
The impedance of a speaker is generally related to frequency. The rated impedance is the impedance measured from the speaker input when the audio is 400Hz. It is generally 1.2~1.5 times of the voice coil DC resistance. The common impedance of general dynamic speakers is 4Ω, 8Ω, 16Ω, 32Ω, etc.
3. Frequency response
When you add audio signals of the same voltage and different frequencies to one speaker, the sound pressure produced will change. Generally, the sound pressure produced by medium tones is large, while the sound pressure is lower in low and high tones. When the sound pressure drops to a certain value of the medium audio, the high and bass frequency range is called the frequency response characteristics of the speaker.
The ideal speaker frequency characteristics should be 20~20KHz, so that all audio can be replayed evenly, but this cannot be done. Each speaker can only replay a certain portion of the audio well.
4. Distortion
The phenomenon that the speaker cannot realistically reproduce the original sound is called distortion. There are two types of distortion: frequency distortion and nonlinear distortion. Frequency distortion is caused by strong signal playback of some frequencies and weak signal playback of other frequencies, and the distortion destroys the ratio of the original high and low sound intensity and changes the original sound color. Nonlinear distortion is caused by the vibration of the speaker vibration system and the fluctuation of the signal are not completely consistent, adding a new frequency component to the output sound wave.