Different MP3 equalizer settings are not the same. For example, IRIVER and IAUDIO equalizers are divided into five levels, but the frequency division and adjustment levels are also different. iRiver's XtremeEQ is divided into five segments: 50Hz, 200Hz. File, 1KHz file, 3KHz file, 14KHz file, each stage has 10 levels of adjustment: -15dB, -12dB, -9dB, -6dB, -3dB, 0dB, +3dB, +6dB, +9dB, +12dB, +15dB. And IAUDIO is divided into 60Hz file, 250Hz file, 1KHz file, 4KHz file, 12KHz file, each segment has +0db~+12db12 level adjustable. The comparison shows that although the frequency band division is not the same, it is similar, which plays a similar role in the adjustment of sound effects. Let's take a look at the role of each part of the equalizer segmentation:
1.20Hz--60Hz part
This promotion can give a strong feeling to the music, giving people a very loud feeling, such as thunder. It is a powerful and powerful feeling in music. If the amount of this frequency band is too small, the feeling of richness and sturdiness must not be there; and it will lead to the highlight of medium and high frequency and high frequency, which makes the sound lose balance and is not durable. If the elevation is too high, it will be turbid, resulting in poor definition, especially for low-frequency response and low-frequency audio equipment.
2.60Hz--250Hz part
This is the low-frequency structure of music, which contains the basic sounds of the rhythm part, including the main sound of the pitch and rhythm sounds. Its ratio to the high-pitched tone constitutes the balance of the tone structure. Raising this section will make the sound full, and excessive boost will make a rumble. Attenuating these two segments will make the sound thin.
3.250Hz--2KHz part
This section contains the low-frequency harmonics of most instruments, and if you increase too much, the sound will be like the sound in the phone. Excessive elevation of 600Hz and 1kHz will make the sound like a horn. If the 3kHz is raised too much, the speech recognition tone will be masked, that is, the articulation is unclear, and the lip sound "mbv" is difficult to distinguish. If you increase the 1kHz and 3kHz excessively, the sound will have a metallic feel. Since the human ear is sensitive to this frequency band, this segment is usually not adjusted, and excessively increasing this segment will cause hearing fatigue.
4.2KHz--4kHz part
This frequency is an intermediate frequency. If it is raised too high, it will cover up the speech recognition tone, especially if the 3kHz boost is too high, it will cause hearing fatigue.
5.4kHz--5KHz part
This is a frequency band with a sense of presence that affects the clarity of sounds such as languages ​​and instruments. Raising this frequency band makes people feel that the distance between the sound source and the listener is a little closer; if the attenuation is 5 kHz, the distance of the sound will be farther; if it is raised by 6 dB at around 5 kHz, the sound of the whole mixed sound will be made. The power is increased by 3dB.
6.6kHz--16kHz part
This band controls the brightness, macro brightness and sharpness of the tone. Generally speaking, raising these segments makes the sound loud, but it is not clear. It is impossible to cause the tooth to be too heavy. When the sound is attenuated, the sound becomes clear, but the sound is not loud.
The equalizer can also be set according to the curve of the door limit, so that the ear can feel the sound most easily, so the most natural best!
This allows the low frequency and high frequency to be naturally felt by the ear, which means that the best EQ setting should match the curve.
It is best to combine the equal-tone curve with the frequency response curve of the headphones when adjusting the equalizer. For example, if the frequency response curve of the earphone is ideal, that is, a straight straight line, then the equalizer can be adjusted to a similar acoustic curve pattern corresponding to the corresponding sound pressure level, so that the sounds are heard in various frequency bands. The loudness is basically balanced; in fact, the frequency response curve of the earphone/earplug is ideally flat, and it is also affected by the different wearing conditions of each person's ear, so it takes a while to adjust the equalizer. Think about the sound characteristics of the player and headphones that sound in your ears.
Finally, it should be noted that each person's sound perception is different for different frequencies. The frequency response of the audio playback device is also different. The human hearing curve is only based on statistical data to draw sounds that others sound very natural. It will feel uncomfortable, so the adjustment of the equalizer needs to be adjusted according to the characteristics of the listening and the playing device used.
Common preset sound effects
Although most of the MP3 players now support custom EQ, in order to facilitate user operation, almost all MP3 players will preset several representative EQ settings in the interior, and some even reach 30 kinds. Take IAUDIO M3 as an example to introduce several common EQ modes:
NORMAL: Normal sound, all bands do not have any increase or decrease, suitable for friends who like the original taste;
ROCK: Rock music, its high and low ends are greatly enhanced, the bass makes the music powerful and powerful, the rhythm is strong, and the high-pitched parts are clear and even harsh;
POP: Pop music, its curve is roughly the same as ROCK, slightly lowering the low frequency than ROCK, enhancing the high-pitched part, and the instrument performance is even better;
Jazz: jazz, which boosts the low frequency and 3-5 kHz parts to enhance the sense of presence;
Classic: classical music, it is also promoted in two parts, mainly highlighting the performance of the instrument, the performance of the sound field is more, suitable for the interpretation of the classical music of the big scene;
Vocal: vocal, the frequency of the voice of the human voice is relatively narrow, the improvement is mainly concentrated in the intermediate frequency part, suitable for listening to comic essays or recording files.
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