In practical application, the frequency range and frequency response of audio has always been a problem of great concern. However, because of the professional knowledge of subdivision, many people are in frequency.
The understanding of the rate range and frequency response is rather one-sided. What is the difference between frequency range and frequency response? Is the higher the frequency the better the sound effect? Sound frequency
How high is the right height? For such problems,

Xiaobian made the following compilation:

Definition of frequency range and frequency response

Frequency range refers to the range between the lowest effective playback frequency and the highest effective playback frequency that a sound system can reproduce; frequency response refers to the range between the lowest effective playback frequency and the highest effective playback frequency.
When a constant voltage output audio signal is connected to the system, the sound pressure produced by the speaker increases or decreases with the frequency, and the phase changes with the frequency.
The phenomena of change, the correlation of sound pressure and phase to frequency (variation), are called frequency responses, unit decibels (Db).

Two. Distinguish the frequency of sound system.

Frequency characteristics of sound systems are often described by ordinates of decibel scales representing power and frequency response curves of logarithmic scales representing frequencies in abscissas. Sound of sound
When the sound power is 3 dB lower than the normal power, this power point is called the high frequency cut-off point and the low frequency cut-off point of the frequency response. Between high frequency cut-off point and low frequency cut-off point
Frequency is the frequency response of the equipment; the curves of sound pressure and phase lag changing with frequency are called amplitude-frequency characteristic and phase-frequency characteristic respectively.
Rate characteristics. This is an important index to evaluate the performance of the speakers. It has a direct relationship with the performance and price of the speakers. The decibel value of the speakers exceeds that of the novel speakers.
The frequency response curve is flatter, the distortion is smaller, and the performance is higher. For example, the frequency response of a loudspeaker is 60Hz ~ 18 km / h / 3 dB. These two concepts sometimes do not differentiate, they are called frequency response.

Three. How high is the audio frequency?

Theoretically, the frequency response from 20 to 20000Hz is sufficient. The voice below 20Hz can not be heard, but other sensory organs of the human body can perceive it.
Aware of the so-called bass intensity, so in order to play a variety of musical instruments and language signals perfectly, the amplifier to achieve high fidelity goals, in order to tone the harmonics of all the weight
Put it out. Therefore, the bandwidth of the amplifier should be expanded, the lower limit should be extended to below 20Hz, and the upper limit should be increased to above 2000Hz. For signal source (receiver, recording block and
The frequency response of the CD player is different. For example, the frequency response of FM stereo broadcasting stipulated by the European Broadcasting Union is 10/2dB at 40-15000Hz, International
The lowest frequency response index stipulated by the Electrical Commission for the recording stand is 10 / - 2.5 10 / - 4.5 dB (ordinary tape) at 40 - 12500 Hz, which is obviously higher than that.
Numerical value. The upper limit of the frequency response of the CD is 20 000 Hz, and the low frequency end can be very low, only a few hertz. This is one of the reasons why the playback quality of the CD is good.

Four, the wider the frequency range, the better the sound effect.

The harmonic components that make up the sound are very complex, and it's not as good as the wider the frequency range, but it's basically true for medium and low-end multimedia speakers.
Yes. In the labeling of frequency response, we usually see the terms "system frequency response" and "amplifier frequency response," knowing that "system frequency response" is always greater than "amplification."
The range of frequency response is small, so it is meaningless to label amplifier frequency response only, which is only used to deceive some uninformed consumers. Now the speakers are right.
Generally, the range of system frequency response is too large, and the high frequency part is not bad enough, but the labeling on the bass end is extremely untrue, and the foreign famous brand HiFi (high fidelity) speakers are just as good.
Label 4, 50 Hz or so, and the domestic two or three hundred ordinary wooden speakers dare to label this data, it is really laughable! So I would like to tell you that there must be a voice in the low frequency section.
If you want to hear your ears as true, do not readily believe the values on the leaflets. Multimedia speakers play music, songs, game sounds, background music, and movies on MP3 or CD.
The human voice and environmental sound effects in the film are predominant, and these sounds are mostly medium and high pitches, so when choosing a multimedia speaker, we should pay more attention to its performance in the middle and high frequency band, rather than the low frequency band.
Section. If you really pursue the theater effect, a strong subwoofer can definitely meet your needs.