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In the process of using the sound system, excellent sound quality is not only determined by the performance of the sound equipment alone, and a variety of wires are also an important part that cannot be ignored. Here if the wire is compared to a road, then the signal is a car, the road condition is good, the car can go smoothly, so the wire is the key to the "last kilometer" sprint of the sound.
The meridians of the sound system
In the sound system, speakers, amplifiers, processors, microphones, etc., are carrying different functions, and between them are connected by wire, just like the human meridians transmit various information to the brain, if any one has a problem, it will make people appear. Therefore, a good wire plays a crucial role in the transmission of signals.
Audio wire is the "vocal cord" that leads to the sound of nature, and a complete wire is composed of plugs and wires. In front of us, we have made a detailed introduction to the "common audio interface classification", and today, we will sort out those things about the audio wire!
Commonly used audio wire
A perfect sound system involves multiple signals, multiple equipment, and the types of wires used are also diverse. Commonly used audio cables are microphone cable (microphone cable), audio connection cable, audio signal cable, speaker cable, power cord, etc.
1、microphone cable)
Microphone cable (microphone cable) is mainly used for the connection of microphone and audio equipment, and should be classified as weak current control cable in the cable category.
The microphone wire is two cores with shielding (according to strict requirements, the core and shielding should be made of oxygen-free copper), and each core is a structure of several fine copper wires. It is usually composed of two cores, a sheath layer for each core, a tensile cotton filling, a shielding layer and an outer rubber sheath layer.
Microphone cable external rubber sheath layer is usually black, but also red, yellow, blue, green and other different colors. The shielding layer is divided into two types: winding and weaving, winding the shielding layer is wrapped around the two cores and the outside of the cotton yarn filler, and preparing the shielding layer is wrapped around the two cores and the outside of the cotton yarn filler in accordance with the "network" structure.
The preparation of the shielded microphone wire is better than the winding of the shielded microphone wire, from the physical point of view, the anti-interference ability is better, and the price is slightly more expensive.。
Microphone cable can also be used as a connection between devices, but the cost is higher, it is recommended to use audio cable when connecting devices.
2、audio connection cable
Audio connection cable, referred to as audio cable, used to transmit electro-acoustic signals or data, the same two-core with a shielded structure, similar to the microphone cable. The two cores and shielding layers are copper tinned and silver-white in appearance.
The audio connection cable has no cotton stuffing and poor tensile strength, so it is rarely used for the connection of the microphone, and can be used for short distance temporary connection of the microphone in special circumstances.
Usually, in audio engineering, the equipment inside the cabinet is connected by audio cable, because the audio cable is thinner than the microphone cable, which is convenient for bundling the cable inside the cabinet. After bundling, it is more beautiful and the cost is lower than the microphone cable.
3、audio signal cable
The audio signal cable refers to the signal line with the shielded input and output balance signal, which connects the audio front stage and the power amplifier and the balance line. It is used to transmit signals, is the carrier of signals.
The audio signal cable is actually a number of audio connection cables combined in a cable. Because the number of internal audio connection cables is different, there are 4, 8, 12, 24 and other ways.
The weight of the audio signal cable is larger, and there is usually a steel wire inside the cable to increase the tensile strength. The audio signal cable is mainly used for the signal transmission connection between peripheral equipment and power amplifier in live performances, and the signal connection from the control room to the stage in sound engineering.
4、speaker cable
The speaker line is used to connect the power amplifier and the speaker, where the current signal is much larger than the signal line and the audio line mentioned earlier. Because of the large signal amplitude, such lines often have no shielding layer.
For this kind of Wire rod, the resistance should be as low as possible, and the thick and short wire and reasonable wiring should be selected. Because the output impedance of modern power amplifiers is very low, the requirements for speaker wires also increase, such as the selection of large cross-sectional area or multi-stranded wires.
Speaker line From the appearance, there are sheathed speaker line, gold and silver line. Sheath line according to the outer sheath and the use of different occasions, there are rubber sleeve speaker line and plastic sleeve speaker line.
Gold and silver speaker wire is usually transparent or translucent sheath wrapped gold and sound copper wire core, so commonly known as "gold and silver wire".
There are also two cores of the same color, but text is usually printed on the outer sheath of one core to distinguish the two cores. In short, the speaker wire is basically two copper wires with their own sheaths.
Speaker cable according to the use of different requirements, there are multi-core speaker cable, such as four-core speaker cable. The speaker line also has a different cross-sectional area, that is, the thickness of the copper core is different, such as 1 square, 2 square, 4 square, and so on. The larger the cross-sectional area, the smaller the power loss when transmitting signals. There are also fixed speaker cables and mobile speaker cables for indoor use.
5、Power cord
The choice of power cord in the sound system can not be sloppy, otherwise there will be security risks. Good power cord frequency band is relatively narrow, will filter out some harmonics and clutter, will let your sound system super level play.
Professional audio power cord usually uses pure oxygen free copper (OFC) as a conductor, because it has high conductivity, high mechanical strength, small size, small resistance characteristics, which can reduce conductor heating and voltage loss, it is best with shielding with anti-interference effect.
Usually, the length ratio of the positive wire (live wire) and the ground wire is about 10:1, and the ground wire is better than the positive wire, 8GA line is the most used, followed by 6GA, 4GA, and 2GA and 0GA are used less.
Good equipment to configure the wire
The role of the audio wire is to connect all parts of the sound system, cooperate with each other, and transmit audio signals between the devices. It is the "bridge" that builds the entire system operation, which is crucial in the sound system to ensure that the audio signal is transmitted without loss and distortion in transportation, which is the original intention of the sound wire.
However, there are a large number of people, do not attach much importance to the importance of audio cable. The gap between high-quality audio cable and inferior audio cable is not only the material is not the same, the internal structure design principle is not the same, so whether it is signal transmission performance or anti-external electromagnetic interference ability is completely not on the same order of magnitude. Only high-quality wire is the guarantee of high quality audio output of sound system. The following Xiaobian will talk to you about a few tips for purchasing audio wire.
1、see the number of cores
core is the conductor of audio transmission, but also the most direct medium for transport signal source, so the number of cores of audio wire is very important.
Many people think that the more audio wires the better, in fact, this is not the case. The number of cores of audio wires has its conventional algorithm, and the number of cores of audio wires is directly related to the power and spatial wiring of audio equipment.
1.0 square core: suitable for space wiring below 15 square meters, power below 200W audio use;
1.5 square wire core: suitable for space wiring under 20 square meters, power below 400W audio use;；
2.0 square core: suitable for space wiring below 25 square meters, power below 600W audio use;
2.5 square wire core: suitable for space wiring below 30 square meters, power below 800W audio use;
4.0 square core: suitable for space wiring below 30 square meters, power below 1000W audio use;
※The above parameters are commonly used to create high sound quality.
2、look at the copper core
in addition to the number of cores, the material of the wire core is also very important, high-quality audio wire on the market with oxygen-free copper core as the mainstream material.
4N grade oxygen-free copper is high purity oxygen-free copper, the purity is more than 99.99%, 4N is the highest purity level that can be achieved by technically oxygen-free copper.
High purity oxygen-free copper conductor, true restore sound quality, accurate transmission of information, high conductivity, processing performance, welding performance, corrosion resistance and low temperature performance are very good.
3、Sheath layer
Outer sheathing layer sheath tentacles can almost detect the advantages and disadvantages, if the line feels soft or rough hard, are inferior wire rod.
At present, the most commonly used sheath material for high-grade audio wire is high-grade vinyl chloride;
The ring protective sleeve material is wear-resistant and antifreeze, and can withstand high and low temperatures from -25℃ to 75℃;
In line with Rohs standards, in strict accordance with ISO9001-2008 quality system production;
The wire is soft and easy to use, the whole plate has no joint, the imported precision inkjet printer inkjet, the length is accurate.