Speaker frequency range/response

The former refers to the range between the lowest effective playback frequency and the highest effective playback frequency that the sound system can play back; the latter refers to the change of the sound pressure generated by the sound box with the frequency when a constant-voltage output audio signal is connected to the system. The increase or attenuation occurs, and the phase changes with frequency. This type of sound pressure and phase-to-frequency correlation (change) is called the frequency response in decibels (dB).

The frequency characteristics of the sound system are usually described by the ordinate scale of the decibel scale and the frequency response curve of the frequency expressed by the abscissa of the logarithmic scale. When the sound power is 3dB lower than the normal power, this power point is referred to as the high frequency cutoff point and low frequency cutoff point of the frequency response. The frequency between the high frequency cut-off point and the low frequency cut-off point is the frequency response of the device; the curves of the sound pressure and phase lag with frequency change are called “magnitude-frequency characteristics” and “phase-frequency characteristics”, respectively. characteristic". This is an important indicator to investigate the performance of the speaker, it has a direct relationship with the performance and price of the speaker, the smaller the decibel value indicates that the frequency response curve of the speaker is flatter, the distortion is smaller, the performance is higher. Such as: a speaker frequency response is 60Hz ~ 18KHz + / - 3dB. These two concepts are sometimes not distinguished, it is called frequency response.

In theory, a frequency response of 20 to 20000 Hz is sufficient. Sounds lower than 20Hz, although not heard by human sense organs, can sense the so-called bass intensity, so in order to perfectly play a variety of musical instruments and speech signals, the amplifier must achieve high-fidelity goals. Replays each harmonic of the tone. Therefore, the frequency band of the amplifier should be expanded. The lower limit should be extended to less than 20 Hz, and the upper limit should be increased to more than 20,000 Hz. The representation of the frequency response of signal sources (radio heads, cassettes, and CD players, etc.) varies. For example, the frequency response of the FM stereo broadcast specified by the European Broadcasting Union is 10/−2 dB at 40 to 15000 Hz. The minimum frequency of the frequency response specified by the International Electrotechnical Commission for recording cassettes: 10/—2.5 10/—4.5 dB at 40 to 12500 Hz (common With), the actual attainable indicators are significantly higher than this value. The upper limit of the frequency response of the CD player is 20000 Hz, and the low frequency end can be made very low, only a few hertz, which is one of the reasons for the good playback quality of the CD player.

However, the harmonic components that make up the sound are very complicated, and the sound is not as good as the wider frequency range, but it is basically correct for medium and low-end multimedia speakers. We often see "system frequency response" and "amplifier frequency response" in labeling the frequency response. To know that the "system frequency response" is always smaller than the "amplifier frequency response," so only the label "Magnifier frequency response" does not make any sense. It is only used to trick some unsuspecting consumers. Today's speaker manufacturers generally have too much scope for system frequency response, and there are not many high-frequency partial differences, but they are extremely unreal at the bass end. Foreign brand-name HiFi loudspeakers are also marked at about 4,50 Hz. , And domestic two or three hundred wooden ordinary speakers actually dared to label this data, so we must admonish everyone that low-frequency sound must listen to the truth, do not easily believe the value on the leaflet.

The music in multimedia speakers is based on playing MP3 or CD music, songs, game sound effects, background music, and vocals and ambient sound effects in movies. These sounds are mostly mid- and high-range, so when selecting multimedia speakers, It should look more at the performance of sounds in the mid-to-high frequency band than at low frequencies. If you really pursue cinematic effects, then a powerful subwoofer can meet the demand.