Knowledge popularization of speakers and power amplifiers

                         Knowledge popularization of speakers and power amplifiers

With the improvement of people's living standards, in addition to material needs, more and more people begin to pursue spiritual enjoyment. Some of them are keen on audio and enjoy the fun brought by music. There are also people who fiddle with audio equipment and enjoy the happiness brought by different equipment. In daily life, a good sound system can not only bring enjoyment to the ears, but also create an atmosphere. For example, watching movies at home, a set of surround sound can make you feel immersive. When you take a nap in the study and drink coffee, a set of hifi bookshelf box can bring you relaxation. When you play games, a set of high-resolution speakers can allow you to distinguish the position of the enemy, enjoy the shock brought by the game, and feel the real fighting scene. In short, more and more people began to have requirements for sound quality.

But many people are often at a loss when choosing speakers. Faced with so many types of speakers on the market, so many types of speakers, what is a speaker, what is a speaker, and what is an active speaker? What is a passive speaker? What is an amplifier? How to combine power amplifier and speakers? Many people get confused when choosing. Many times I spent money to buy a set of speakers that is not suitable for me, or that I don't like. This time, we will carry out the literacy of audio knowledge and learn the basic knowledge of audio, so that you can know what you want when choosing an audio.

1. What is a power amplifier?

Power amplifier is the abbreviation of power amplifier, which means to amplify the power. For example, the output of the headphone port of our mobile phone can only drive the headphone, which can only be enjoyed by one person. Because the power of the headphone output port is very limited, the power level of the headphone port is at the milliwatt (mW) level. When we want the music output by the mobile phone to be heard by the whole square. Well, you need an amplifier. The audio signal at the headphone output port is amplified by tens or even hundreds of times of power. The energy of the sound is amplified. Let the milliwatt-level output be transformed into tens of hundreds of watts or even kilowatts of output through the power amplifier. That's what an amplifier does.

2. What is a speaker?

To answer the first question, as we all know, the power amplifier is just an electrical power amplification machine. The power amplifier amplifies the low-voltage and low-power audio signal dozens of times. At this time, the voltage amplitude of the audio signal will be increased, and the current will also be increased. The whole power is amplified. At this time, the speaker is required to convert the amplified audio signal into an electro-acoustic conversion output. Connect the amplifier to the loudspeaker. At this time, the low-power audio signal from the earphone port of the mobile phone passes through the power amplifier and the speaker. The output energy is amplified. The sound at this time can make the crowd in the whole square feel the music. At this time, the power output of the power amplifier is sent to the speaker, which can spread the sound to hundreds of meters.