Audio test signal frequency description table

<80Hz
Below 80Hz are mainly low-frequency percussion instruments, such as bass drums, timpani, and piano, cello, large, and a few instruments with extremely low frequencies. This part is good if there is no music appreciation. The impact is not great. It is not easy to replay this part well, and the requirements for equipment are also high. Many high-end equipments, in order to perform well in the frequency band above 80 (or around 80) Hz, would rather cut off the frequency below 80 (or around 80) Hz, so as not to reproduce badly, but affect the effect of the main frequency band. Extremely low frequency 20Hz is the lower limit of human hearing. You can test the lower limit of low frequency replay of your equipment. 25Hz, 31.5Hz, Hz, 40Hz, 50Hz and 63Hz in low frequency are the lower limit of replay for many speakers. If your speaker is at one of these frequencies If the sound drops sharply, it means that this frequency is the lower limit of low frequency reproduction of your speakers.

80－160Hz
The sound in the 80-160Hz frequency band mainly expresses the sense of thickness of the music. If the sound reproduction effect is good in this part, the music will feel thick and confident. If this part performs well, you will not even feel the lack of bass when it is lacking below 80Hz. If the performance is not good, the concert will be dull and even weak. It is the upper limit of the replay of many subwoofer speakers. With this, you can judge the upper limit of the frequency of your subwoofer speakers.

300－500Hz
The sound in the 300-500Hz frequency band mainly expresses the human voice (singing, recitation), the thickness and strength of the human voice can be expressed in this frequency band, otherwise the human voice is bright and clear, otherwise thin and turbid.

800Hz
The general equipment of 800Hz is easy to broadcast, but be careful not to overdo it. If this section is too much, you will feel that the frequency response of the audio becomes narrower, the treble lacks the level, and the fullness of the low frequency is not enough.

1000Hz
1 kHz is the standard reference frequency for audio equipment testing. The parameters usually given in audio equipment are tested at 1 kHz.

1200Hz
1.2kHz can be a little more, but it should not exceed 3dB, it can improve the brightness of the sound, but too much will make the sound hard.

2000-4000Hz
2 ~ 4kHz has a great influence on the brightness of the sound, this section of the sound is generally not suitable for attenuation. This section has a great influence on the level of music. There is an appropriate improvement to improve the brightness and clarity of the sound, but there should not be too much prominence at 4kHz, otherwise the female voice will be too heavy.

8000-12000Hz
8 ～ 12kHz is the treble range of music, which is the most sensitive to the high frequency performance of the sound. Properly highlighting (below 5dB) will greatly help the level and color of the sound, and it will also make people feel rich in treble. However, too much words will increase the background noise, for example: the noise of the system (sound card, sound source) will be clearly displayed, and it will also make people feel sharp and hairy. If this period is lacking, the voice will lack infectivity and vitality.

14000Hz
Above 14kHz is the overtone range of music. If it is lacking, the sound will lack infectivity and nobility. For example, the violin will have no "loose fragrance". This part should not be too much, basically straight or slightly attenuated (not more than -3dB).

20000Hz
20 kHz is the upper limit of human hearing, which can test the upper limit of high-frequency playback of your equipment. 16 kHz-20 kHz may disappear in some equipment. At this time, your equipment may not be able to replay this frequency. If you are older, it may be due to your hearing loss.
Sine wave frequency sweep signal 20Hz-20kHz sine wave frequency sweep signal is automatically and smoothly changed from 20Hz to 20kHz frequency. By playing this piece of test information, you can quickly determine where there is a frequency problem.

If you feel that a certain frequency band is particularly harsh or extremely weak, it indicates that the frequency response of the equipment is not straight. You can analyze each link in the equipment to find the problematic equipment; if there is no problem with the equipment, it may be that the frequency band causes indoor Waves cause resonance, you can move the speaker and adjust the speaker position to see if it can be improved.
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