1. The difference between whole and part.
It means that the audio system is a complete system, and the speakers are only a part of this system. It belongs to sound equipment, and the system also includes other mixing equipment.
2. The difference between professional and amateur.
Both can sound. However, the sound is a professional-grade sound system from the function to the configuration. The speaker is usually a simple sound system composed of one or two ordinary speakers. For example, a home theater can be called a stereo, and a computer speaker is usually called a speaker because of its simple function and low effect.
A speaker refers to a device that can convert audio signals into sound. Generally speaking, it refers to the power amplifier provided in the main body of the speaker box or the subwoofer box. After the audio signal is amplified, the sound is played back by the speaker itself to make the sound louder.
The sound box is the terminal of the entire sound system. Its function is to convert the audio electrical energy into corresponding sound energy and radiate it to the space. It is an extremely important part of the sound system, and is responsible for converting electrical signals into acoustic signals for human ears to listen directly.
The composition of the speaker:
There are all kinds of speakers on the market, but no matter which one is composed of the two most basic parts of the speaker unit (the term speaker unit) and the cabinet, in addition, most speakers use at least two or more The speaker unit implements the so-called multi-channel audio reproduction, so the frequency divider is also an indispensable part. Of course, there may be other components in the speaker, such as sound-absorbing cotton, inverted tubes, folded "labyrinth pipes", ribs / reinforced partitions, but these components are not essential for any speaker. The element has only three parts: the speaker unit, cabinet and crossover.
Speakers are classified as follows:
The classification of speakers has different angles and standards. According to the acoustic structure of the speakers, there are closed boxes, inverted boxes (also called low-frequency reflection boxes), passive radiator speakers, and transmission line speakers. For their respective characteristics, see details. Related question and answer. Inverted boxes are the current mainstream in the market; judging from the size and placement of speakers, there are floor boxes and bookshelf boxes. The former is relatively bulky and is generally placed directly on the ground, and sometimes shock-absorbing feet are also installed under the speakers. nail. Due to the large volume of the cabinet and the convenience of using larger and more bass units, the floor box is usually better at low frequencies, and has a higher output sound pressure level and strong power carrying capacity, so it is suitable for larger listening areas or more comprehensive requirements. Use in occasions.
The bookshelf box is small and usually placed on a tripod. It is characterized by flexible placement and does not occupy space. However, due to the volume of the box and the size and number of the woofer, its low frequency is usually not as good as the floor box, carrying power and output sound pressure. The level is also smaller, suitable for use in smaller listening environments; it is divided according to the narrow bandwidth of the playback, there are wideband speakers and narrowband speakers, most speakers are designed to cover the widest possible frequency band , Belonging to a wide-band speaker. The most common narrow-band speakers are the subwoofers (subwoofers) that have emerged with home theaters. They are only used to restore a very low frequency range from ultra-low frequency to low frequency; according to the presence or absence of a built-in power amplifier, they can be divided into passive speakers and For active speakers, the former has no built-in power amplifier and the latter has. Most current home speakers are passive, but subwoofers are usually active.
Sound refers to other sounds besides human language and music, including the sound of the natural environment, the sound of animals, the sound of machine tools, various sounds made by human actions, etc. The sound probably includes a set of power amplifier, peripheral equipment (including compressor, effector, equalizer, VCD, DVD, etc.), speakers (speakers, speakers), mixer, microphone, display equipment, etc. Among them, speakers are sound output devices, speakers, subwoofers and so on. A loudspeaker includes three types of speakers: high, low, and medium, three but not necessarily three. The development history of technology can be divided into four stages: electron tube, transistor, integrated circuit, and field effect tube.
Audio equipment probably includes power amplifiers, peripheral equipment (including compressors, effects, equalizers, exciters, etc.), speakers (speakers, speakers), mixers, sound sources (such as microphones, musical instruments, VCD, DVD) display equipment Wait to add up. Among them, speakers are sound output devices, speakers, subwoofers, etc., a speaker includes high, low, and middle speakers, three but not necessarily three.
Speaker sound principle:
To understand the principle of sound produced by the speaker, we first need to understand the propagation of sound. The propagation of sound requires a medium (vacuum cannot transmit sound); the sound must rely on all gases, liquids, and solids to spread out as a medium. These substances as a medium of transmission are called media. Just like a water wave, you throw a stone on the calm water, and there is a wave on the water surface, and then propagate to the other side for 4 weeks; the sound wave is also formed in this way. The frequency of the sound wave is in the range of 20-20,000 Hz, and can be heard by the human ear; below or above this range, the human ear cannot hear.
Water waves and sound waves propagate in the same way. Only through the propagation of the medium can the human ear hear the sound
Sound waves can propagate in gases, solids, and liquids
Let me talk about the working principle of the speaker. A horn is a device that converts electrical signals into acoustic signals. It consists of coils, magnets, paper cones, etc. The current (alternating current) of different sizes output by the amplifier moves the coil under the action of the magnetic field through the coil. The coil is connected to the paper cone to drive the paper cone to vibrate.