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The four elements of the correct purchase of audio

2021-03-27 59
The quality and tone of the speakers directly affect people's hearing enjoyment. With the rapid development of the audio-visual industry, there are a wide variety of speakers on the market, and the quality is also uneven, which brings a lot of trouble to consumers who buy speakers.

1. Determine the purpose
There are many types of speakers on the market, and their functions vary. Therefore, you must first determine the purpose of the speaker before purchasing, and then select the speaker with the appropriate function according to the actual situation. In addition, determine the budget for purchasing speakers. Because audio plays an important role in the entire audio system, its investment ratio is relatively large. But when matching other equipment, you must also pay attention to the reasonable combination, and there should be no top-heavy phenomenon.

2. Tone
In addition to function-oriented purchase points, the choice of speaker tone is quite critical. Every music lover has different tastes and preferences, and the sound characteristics of speakers produced by different countries and brands will also vary. For example, the British B&W speakers show the orthodox British style, and they are best at expressing classical music. , Symphonic music. Because the sound characteristics of its speakers are soft, natural, flexible, and spatial;

The main representative of American style is JBL, which can make rock music get better performance, because its characteristics of restoring timbre are strong tone following ability, good transient characteristics, vivid sound and passion;

And speakers like Tanner with strong expressiveness, strong resolution, delicate timbre, rich colors, and low distortion just show the Nordic style dominated by pop music, and it is especially true to the human voice. The vocalization, breath, speech, and resonance of singing are all true and real, which gives the human voice a kind of intimacy.

Mr. Li Jihui, a well-qualified audiophile of "World One Fever", also said: "Each speaker has its own personality and performance. The American voice is bold and powerful, the British voice is warm and thick, and the German and Nordic pronunciations are clear and untainted. , Italian sound is romantic and luxurious, the matching effect is ever-changing, it is difficult to have standards, only relative preferences. When each set of audio works, it represents every music interpretation master.

Three, performance indicators
A speaker is actually a transducer that converts electronic signals into sound. Therefore, for safety and service life considerations, reasonable performance indicators are very important. The technical indicators of speakers usually include:

1. Power
The power determines the louder sound intensity that the speaker can emit, and it feels like how powerful the sound of the speaker can be. The power of the speaker is mainly determined by the power of the power amplifier chip and the power of the power transformer. For an ordinary household user's room of about 20 square meters, the real power of 60W is sufficient, but the larger the reserve power of the power amplifier, the better, and it is better to be more than twice the actual output power.

2. Frequency range and frequency response
In theory, a frequency response of 20 to 20000 Hz is sufficient. Sounds below 20Hz can not be heard, but other human sensory organs can perceive it, that is, the so-called bass intensity. Therefore, in order to play various musical instruments and language signals well, speakers must achieve the goal of high fidelity. Replay all harmonics of the tone.

3. Distortion

Distortion is divided into harmonic distortion, intermodulation distortion and transient distortion. It is more important in speakers and speaker systems. It directly affects the degree of sound quality and tone reproduction. This item is often expressed as a percentage. The smaller the value, the smaller the distortion. The distortion of ordinary multimedia speakers should be less than 0.5%, and the distortion of the subwoofer is generally larger, less than 5% is acceptable.

The four elements of the correct purchase of audio

4. The sensitivity of the speaker (unit dB)
For every 3dB difference in the sensitivity of the speaker, the output sound pressure will double. Generally, 87dB is the medium sensitivity, 84dB or less is low sensitivity, and 90dB or more is high sensitivity. The increase in sensitivity comes at the expense of increased distortion, so as a high-fidelity speaker, to ensure the degree of sound reproduction and reproducibility, some sensitivity requirements must be reduced.

5. Signal-to-noise ratio
The signal-to-noise ratio refers to the ratio of the normal sound signal played back by the speaker to the noise signal when there is no signal. The higher the signal-to-noise ratio, the lower the noise.

Four, box material
The main function of the speaker cabinet is to suppress diffraction, eliminate acoustic short-circuit effects, expand frequency response and sensitivity, and suppress redundant resonance, thereby improving nonlinear distortion and transient performance.

The speaker cabinet materials mainly include: wood, plastic, stone, glass, ceramics, etc.

The frequency range that can cause human hearing is probably between 20Hz-20000Hz. People most like to listen to the bass from 20Hz to several hundred hertz, and an important function of speakers is to enhance and improve the bass. We also know that any substance has a natural vibration frequency. When the externally applied vibration frequency is close to or equal to the natural frequency of the substance, only a small vibration can be applied to the substance to produce a large vibration.

Wooden speakers have good damping characteristics and soft sound quality. But its rigidity is poor, so the bass from the wooden cabinet is mixed with the sound from the vibration of the cabinet, which makes it difficult for us to hear the pure bass of the music origin. There is always a muddy ambiguity when replaying the bass.

The natural vibration frequency of the solid inorganic stone plate is almost hard to resonate with the speaker frequency in the infrasound range. Relatively speaking, the thermal conductivity of slate is better than that of wood. It can balance the temperature inside and outside the box and reduce transient distortion.

As we all know, in a complete audio or home theater system, the quality of the speakers largely determines the quality of the system. A good speaker is not only good sound playback, but more importantly, it can pass all the energy and enthusiasm in the music to you. I hope that the above four purchase suggestions can provide some references for you to choose your favorite speakers, so that you can more easily experience the good mood brought by music.
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