China’s audio has been developed for more than 20 years, and there is still no clear standard for sound quality. Basically, it depends on everyone’s ears, users’ feedback, and the final conclusion (word of mouth) that represents the sound quality. No matter whether the audio is listening to music, singing karaoke, or dancing, the quality of its sound depends mainly on four factors:

1. Signal source

The function of the function is to amplify and output the weak level signal source to the speaker, and then the vibration frequency of the speaker unit in the speaker will emit sounds of various frequencies, that is, the high, medium, and low frequencies we hear. The source has noise (distortion) or some signal components are lost after compression. After amplification by the power amplifier, these noises will be amplified more and the missing components will not be able to be released, so the sound source used when we evaluate the sound is good Bad is critical.

2. The equipment itself

In other words, the power amplifier should have a high signal-to-noise ratio, a wide effective frequency response, and low distortion. The effective power frequency of the speaker should be wide, and the frequency response curve should be flat. The frequency response of 20Hz-20KHz can be said to be very good. At present, it is rare for a speaker to reach 20Hz–20KHz+3%dB. There are many speakers on the market that the high frequency can reach 30 or even 40KHz. This shows that the sound quality is constantly improving, but we are normal people. It is difficult to distinguish the signals above 20KHz in the ear, so it is not necessary to pursue some ultra-high frequencies that we cannot hear. Only the flat frequency response curve can reproduce the original sound realistically, and the power depends on the size of the used area. , To be proportional. If the area is too small and the power is too large, the sound pressure will cause too many reflections and make the tone turbid, otherwise the sound pressure will be insufficient. The power of the amplifier should be 20% to 50% higher than the power of the speaker in impedance matching so that the bass will be firmer and stronger, the middle and high tone levels will be clearer, and the sound pressure will not be so easily distorted.

3. The user itself

Some people buy stereos for furnishings, some are to appreciate music, and the other is to show off. Simply put, if a person can’t even distinguish the high and low sounds, can he hear what is good sound quality? In addition to being able to listen, some people need to be able to use it. After some people have installed their speakers, the installation technician will simply talk about the effect. The result is that one day someone is curious to move some knobs, and everyone can imagine the effect. This is not the case. It is necessary to understand what technology, just like when we are driving, we must at least understand the functions of various switches, buttons, and knobs in order to give full play to the performance and safety of this car.

4. Use environment

Everyone knows that when there is no occupant in an empty room, the echo is particularly loud when you clap and speak. This is because there is no sound-absorbing material on the six sides of the room or the sound is not absorbed enough, and the sound is reflected. The sound is the same. If the sound absorption is not good, the sound will be unpleasant, especially if the sound is louder, it will be muddy and harsh. Of course, some people say that it is impossible to set up a professional audition room at home. A little money can do it well. For example: hang an embroidered picture on a large wall that is beautiful and sound-absorbing, hang thicker cotton curtains on glass windows, and lay carpets on the ground, even if it’s a decorative carpet in the middle of the ground. The effect will be surprising. If you want to do better, you can hang some soft and non-smooth decorations on the wall or ceiling, which is beautiful and reduces reflection.