How much do you know about the selection criteria for home theater audio?

How much do you know about the selection criteria for home theater audio?

In home theater design,

How to choose your own professional theater audio equipment, what kind of audio equipment is a set of qualified home theater audio equipment.

In the process of home theater design, how should novices choose their own home theater audio system? So what kind of sound is a set of qualified theater speakers?

This is also the confusion of many novice users when they get started, so today the editor will chat with you, what are the criteria for choosing home theater speakers?

1 speaker power

Many users blindly think that the higher the power, the better when choosing a speaker. The main function of the power in the speaker is how loud a sound can be produced. Generally, this parameter is more important for professional audio stage sound reinforcement, but most families The room size of the audio-visual room is basically about twenty or thirty square meters. Therefore, the power of the theater speakers is more than enough at about one or two hundred watts, so there is no need to be too entangled.

In terms of power selection, in home theater thx certification, several certifications of different standards have been designed, such as THX Select for small rooms, TXH Ultra for medium rooms, and THX Dominus for large film and television rooms, etc. Because different room sizes also have differences in the power of the speakers. Simply put, the larger the room, the higher the power requirements for the speakers.

2 Speaker sensitivity

The so-called speaker sensitivity, to put it simply and clearly, means that after a certain power signal is input to the speaker, the volume that the speaker can emit can also be called the sound pressure level. The unit of general sensitivity is expressed in decibels (DB), and the usual measurement method is Input 1W electric power to the speaker, and measure it at one meter from the central axis in front of the speaker. The sound pressure level obtained at this time is a sensitivity of the speaker.

Of course, when choosing a speaker, the higher the sensitivity, the better. It needs to be based on the environment of your own audio-visual room, the size of the space, and the corresponding power amplifier. Relatively speaking, it is better to recommend a speaker with high sensitivity, but if the impact of low sensitivity is low, it will affect the power amplifier. There are certain requirements for the power.

Therefore, in the early years, home theater equipment was relatively cheap. In order to reduce costs, manufacturers used low-end power amplifiers and high-sensitivity speakers. The sound effect was not very good. This is one of the reasons why many hifi audio players look down on theater players .

At the same time, you will also find that the sensitivity of KTV speakers, professional stage speakers, karaoke speakers, and performance speakers is very high. In order to achieve the same sound pressure level, a high-power amplifier is also required.

The increase in sensitivity comes at the cost of sacrificing the sound quality of the speakers. The higher the sensitivity, the easier it is to hear distortion and noise. (Of course it is not absolute, this aspect can also be solved through technical means, and spend money to deal with it)

3 speaker bandwidth

To be precise, the bandwidth is also one of the important factors to measure a good speaker. The so-called bandwidth is the frequency of the response, that is, the sound frequency that people can hear is 20~20KHZ. The index to measure a good speaker is not only the frequency Wide, such as some other indicators, rated output power, impedance coefficient, harmonic distortion, transient response and so on.

But when we choose home theater speakers, the first thing we need to pay attention to is the environmental range of the sound, followed by flatness. The frequency response must not be lower than 80 Hz. According to the industry THX certification, like some large floor-standing speakers, The lower limit of loudness is lower, but in theater acoustic design, in order to reduce the interference of standing waves, we usually cut it off.

4 Harmonic Distortion

Total harmonic distortion refers to the additional harmonic components of the output signal that are more than the input signal when the signal source is input. Harmonic distortion is caused by the system is not completely linear, and it is usually expressed as a percentage. The sum of all additional harmonic levels is called total harmonic distortion. Total harmonic distortion is frequency dependent. Generally speaking, the total harmonic distortion at the frequency of 1000Hz is the smallest, so many products use the distortion at this frequency as its index.

Harmonic distortion is also a very important parameter for the power amplifier. The harmonic distortion of the power amplifier is generally marked by the total harmonic distortion (symbol THD) at 1000 Hz. Since the harmonic distortion curve of the speaker fluctuates too much, it cannot It is marked like a power amplifier, so the total harmonic distortion value of the speaker in the full screen segment is generally marked.

Speaker size and appearance

Home speakers are different from hifi speakers. You need to buy a pair and place them at home. Home theater system design involves the number of channels and surround sound. Therefore, when doing original home decoration, you need to do it in advance. Good layout planning, pre-embedded decoration, and acoustic treatment belong to the theater customization.

Here not only consider the sound of the speaker, the sound quality is good, but also meet the aesthetics of the whole interior decoration design, so there are certain requirements for the size, appearance and installation method of the speaker. When planning, the audio-visual designer should consider the choice of wall-mounted, embedded, or external-mounted, etc.

Written at the end of the article, the standard of audio is far more than some of the above elements. For novice players, if they can’t really distinguish between good and bad effects, and can’t buy audio products that are completely cost-effective, then they can choose THX In addition to certified audio-visual products, it is recommended to choose home theater speakers with brand awareness to ensure audio-visual effects and after-sales service.