1. The difference between whole and part.
That is, the sound is a complete system, and the speakers are only part of the system. It belongs to sound generating equipment, and the system also includes other mixing equipment.
2. The difference between professional and amateur.
Both can also make sound. But the sound is a professional-level sound system from the function to the configuration. A loudspeaker is a simple sounding system usually composed of one or two ordinary loudspeakers. Just like home theater can be called audio, and computer speakers are usually only called speakers because of their simple function and low effect.
A speaker is a device that converts audio signals into sound. Generally speaking, it refers to the power amplifier built into the speaker cabinet or subwoofer cabinet. After the audio signal is amplified, the speaker plays back the sound to make it louder.
The speaker is the terminal of the entire sound system, and its role is to convert audio power into corresponding sound energy and radiate it to space. It is an extremely important part of the audio system, and it is responsible for converting electrical signals into acoustic signals for human ears to directly listen to.
The composition of the speaker:
There are a variety of speakers on the market, but no matter which one, they are composed of the two most basic parts: the speaker unit (referred to as the speaker unit) and the cabinet. In addition, most speakers use at least two or more The speaker unit implements so-called multi-way split playback, so the crossover is also an essential component. Of course, there may be other components in the speaker, such as sound-absorbing cotton, inverted tube, folded "maze pipe", ribs / reinforcing partitions, but these components are not indispensable for any speaker. The elements have only three parts: the speaker unit, the cabinet and the crossover.
The classification of speakers is:
The classification of speakers has different angles and standards. They are divided 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. Inverter boxes are the mainstream of the current market; judging from the size and placement of the speakers, there are floor boxes and bookshelf boxes. The former is relatively large and is usually placed directly on the ground. Sometimes, shock-absorbing feet are also installed under the speakers nail. The floor box has a large volume and is convenient to use larger and more woofer. Its low frequency is usually better, and the output sound pressure level is higher, and the power carrying capacity is strong. Therefore, it is suitable for large listening area or comprehensive requirements. For occasions.
The bookshelf box is small in size and usually placed on a tripod. It is characterized by flexible placement and does not take up space. However, due to the volume of the box and the size and number of woofers, its low frequency is usually not as good as the floor box, which carries power and output sound pressure. The level is also smaller, suitable for use in a smaller listening environment; divided according to the narrow bandwidth of the playback frequency, there are wide-band speakers and narrow-band speakers. Most speakers are designed to cover the widest possible frequency band. , Belongs to wideband speakers. The most common narrow-band speakers are the subwoofers (subwoofers) that have emerged with home theaters. They are only used to restore a low-frequency to a very low-frequency band; according to the built-in power amplifier, they can be divided into passive speakers and Active speakers, the former does not have a built-in amplifier and the latter has. Most home speakers are currently passive, but subwoofers are usually active.
Sound refers to sounds other than human language and music, including sounds of the natural environment, sounds of animals, sounds of machine tools, and various sounds made by human actions. The sound probably includes a set of amplifiers, peripheral equipment (including limiters, effects, equalizers, VCD, DVD, etc.), speakers (speakers, speakers), mixers, microphones, display devices, etc. Among them, speakers are sound output devices, speakers, subwoofers, and so on. A loudspeaker includes three types of speakers: high, low, and medium. There are three, but not necessarily three. The development history of technology can be divided into four stages: tube, transistor, integrated circuit, and field effect tube.
Audio equipment probably includes power amplifiers, peripheral equipment (including limiters, effects, equalizers, exciters, etc.), speakers (speakers, speakers), mixers, sound sources (such as microphones, musical instruments, VCD, DVD) display equipment Wait a moment to add up a set. Among them, the speakers are sound output devices, speakers, subwoofers, etc. A speaker includes high, low, and medium speakers, three, but not necessarily three.
Speaker sound principle:
To understand the principle of speaker sound, we first need to understand how sound is transmitted. The propagation of sound requires a medium (vacuum cannot transmit sound); the sound relies on all gases, liquids, and solids as media to spread out. These substances that are used as media for transmission are called media. It's like water waves. When you throw a stone on a calm water surface, there is a wave on the water surface, which then spreads to the other side for 4 weeks. The sound wave is also formed like this. The frequency of sound waves is in the range of 20-20, 000 Hz, which can be heard by the human ear; below or above this range, the human ear cannot hear.
Water waves and sound waves travel in the same way. Through the propagation of media, human ears can hear sound.
Sound waves can propagate in gases, solids, and liquids
Let's 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, and so on. The amplifier outputs a current of varying size (AC), which moves the coil under the action of a magnetic field through the coil. The coil is connected to the paper cone to drive the paper cone to vibrate, and the vibration of the paper cone pushes the air to make a sound.