Getting Started with Home Theater--Basic knowledge of audio that you must know

Getting Started with Home Theater--Basic knowledge of audio that you must know

What are the benefits of owning a home theater? You can have cinema-level f configuration is taudio-visual enjoyment at home. However, it is not easy to build a home theater, especially the choice ohe key. When choosing home theater speakers, many friends have a headache for the professional terms in the mouth of the salesperson. Today, let's take a look at the basic knowledge of audio that must be known.

1. Speaker

For speakers, people are both familiar and unfamiliar. The speaker is actually a device that restores electrical signals to sound signals. It can be divided into closed type, horn type, labyrinth type, flat type, phase-inverted type, etc. according to the principle and structure of the sound. Among them, the closed type And inverted type is more common. Generally, authenticity is regarded as an important criterion for evaluating speaker performance.

2. The sensitivity of the speaker

The sensitivity of the speaker actually refers to the sound level that the human ear can perceive subjectively. Generally speaking, for every 3dB difference in the sensitivity of the speaker, the output sound pressure will double. When choosing a speaker, improving the sensitivity is actually at the cost of increasing the degree of distortion. Therefore, if you want to ensure the restoration of the sound, you must reduce the sensitivity requirements. It should be noted that although sensitivity is an indicator, it has nothing to do with the sound quality of the speaker.

3. Distortion

As a parameter of the audio, the degree of distortion refers to how much the output signal of the audio changes compared with the original signal after a signal is input to the audio, and it is expressed in percentage. Distortion can be divided into harmonic distortion, intermodulation distortion and transient distortion, which directly affect the restoration of sound quality and timbre. The smaller the value, the smaller the distortion.

4. Signal-to-noise ratio

The signal-to-noise ratio is also an indicator of audio, which is directly related to the broadcast quality of the audio. It refers to the ratio of the sound signal and the noise signal played back by the audio under normal working conditions. Usually, the lower the signal-to-noise ratio and the smaller the input signal, the more serious the noise will appear in the speaker.

5. Scalability

When choosing a speaker, scalability is a very important indicator. So, what exactly is scalability? It refers to whether the speaker can support simultaneous input of multi-channel audio signals, whether there is an output interface connected to passive surround speakers, whether it supports USB input or other digital input forms. Generally, the better the scalability of the audio system, the stronger the adaptability in the future and avoid being eliminated faster.