speaker Rated impedance
Speaker is the speaker system (commonly known as speakers) in the key parts of the speaker sound quality is mainly determined by the performance of the speaker, and then determine the entire set of playback indicators. Speaker performance indicators are rated power, rated impedance, frequency characteristics, harmonic distortion, sensitivity, directivity and so on.
The performance of the loudspeaker is measured primarily by the following metrics:
1, rated power (W) d
There are many kinds of distortion of the speaker, the common harmonic distortion (mostly by the speaker magnetic field is not uniform and the distortion of the vibration system caused by, often produced at low frequencies), intermodulation distortion (due to two different frequencies of the signal at the same time to join the speaker, Mutual deterioration due to mutual modulation) and transient distortion (due to the inertia of the vibration system can not follow the signal changes, resulting in signal distortion) and so on. Harmonic distortion refers to the replay, the original signal does not increase the harmonic components. Speaker harmonic distortion from the magnet magnetic field is not uniform, the characteristics of the diaphragm, voice coil displacement and other non-linear distortion. At present, the better speaker distortion index is not greater than 5 [%].
2, sensitivity (dB / W)
The sensitivity of the loudspeaker is usually the size of the sound pressure measured at 1 m at the front of the loudspeaker when the input power is 1W. Sensitivity is a measure of whether the speaker can reproduce the details of the audio signal. The higher the sensitivity, the speaker can respond to all the details of the audio signal. The sensitivity of the Hi-Fi loudspeaker should be greater than 86dB / W. 3, directivity
Speakers for different directions of radiation, the sound pressure frequency characteristics are different, this feature is called the speaker of the directivity. It is related to the caliber of the loudspeaker, when the caliber is large, the tip is pointed and the caliber is wide. Directivity is also related to frequency, in general, for 250Hz below the low-frequency signal, there is no obvious directivity. The high frequency signal below 1.5kHz has obvious directivity. Although any speaker has its strengths and weaknesses, especially in the limited budget, low-cost speakers are not easy to get the perfect effect, but regardless of any price and level of the speaker, there is a certain reference standard or direction The
1, test the quality of low frequency
Poor speakers produced by the low frequency can be deaf, but completely the kind of bloated and loose, lack of sense of layering and strong sense. Good low frequency should be clean and bright, structured, not dragging the water, innocent people like, even if the various low-frequency instruments such as drums, bass guitar and piano bass, can easily distinguish. So do not easily be low-frequency sense of the amount of deceived, poor low-frequency sound as a natural sound to the comfortable.
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