There are many types of wiring and connectors. Below we will briefly introduce the common types of wires and connectors:
Introduction to various wires:
1, professional audio cable:
Now the audio cable has two cores, three cores, four cores, five cores, etc. This kind of line can be used to transmit high quality audio signals because of the good shielding effect; now more professional microphones generally use more than three cores. The wire has strong anti-interference ability and can be transmitted over long distances. Of course, this wire can also transmit other signals, such as DMX512 control signals for transmitting computer lights.
2, professional speaker cable:
In the amplifier and speaker connection of the professional audio system, the resistance of the speaker cable should be as low as possible, and the thick and short wires and reasonable wiring should be selected. Speaker cables are commonly used in multi-core, 50-core, 100-core, 200-core and other double-layer sheathed wires, commonly known as gold and silver wires; as well as fixed speaker cables and mobile speaker cables for indoor use.
3. Coaxial cable:
Generally used in video, there are also some audio cables. Because of the poor anti-interference ability of this cable, and the design is not mainly used to transmit audio signals, it is not suitable for long-distance audio signal transmission. 
4. Centralized cable:
That is, multiple signal lines are wrapped in the same protection tube, which is generally used inside the connection system to reduce the number of independent wires. It is now also used in special vehicles such as TV OB vans, underground pre-buried and other. This kind of line is generally processed by professional manufacturers, and the quality is more secure.
5, optical fiber:
Many transmission cables commonly used on recording equipment such as CDs or MDs transmit digital signals. With the popularity of digitalization, the use of optical fiber in audio systems will be more and more. 
6, MIDI cable: usually a five-core cable,
Sending information about MIDI is now mostly used on keyboards, effects, and more. 
About the fever signal line dedicated to high-fidelity audio:
The audio signal line is an indispensable part of the analog audio signal from the sound source to the power amplifier transmission. These signal lines are different according to the occasions used by the audio equipment. The circuit design of the power amplifier is different, and it is divided into balanced transmission line and unbalanced transmission line. Do you know their role and distinction?
Unbalanced transmission line:
Unbalanced transmission is a very popular analog audio signal line. From the CD player to the preamplifier to the post amplifier, it is inseparable from its connection transmission, because its wiring plug is similar to the one that needs to be placed. Lotus, so the enthusiasts call it the lotus terminal line (pictured). The signal line of the lotus terminal is a two-core structure, the core of the middle is the signal + transmission core, the core of the periphery is the signal core, and the grounding point of the core and the circuit board and the negative pole of the audio signal are connected to ensure Signal transmission and shielding from external interference! Therefore, unbalanced is also called single-ended input or single-ended output. One signal end and one reference end (ground). 
This is the AC-1 (Silver Ring Snake Series) designed by Tianyi to produce an oxygen-free copper-grade (unbalanced) signal line balanced transmission signal line with a purity of 99.999%:
The balanced transmission signal line is a relatively complex three-core audio analog signal transmission line. This is a professional signal line with strong anti-interference ability during transmission. The insiders all call him the "card head signal line". They are used in the transmission of sound source to amplifier in high-end audio, or in professional performance occasions requiring smaller transmission loss and more reliable signal transmission. The balanced transmission signal line uses three-terminal balanced transmission (Figure 2). The terminals are: one ground (shield layer), two positive (signal hot end), three negative (signal cold end), so the balance line is called double-ended input. Or double-ended output. One of the two signal terminals is reversed to the other. There is also the public "land".
This is the PX-1 (Golden Snake Series) designed by Tianyi. The purity of the single crystal oxygen-free copper with high purity of 99.9999% is balanced with the transmission signal line. Is the unbalanced transmission signal line selected? Depending on the circuit form of your power amplifier circuit, the single-ended input is mostly an unbalanced circuit, which can directly select the unbalanced transmission signal line, that is, the lotus terminal line. For the power amplifier of the balanced circuit, it is better to select the balanced transmission signal line.
In the balanced transmission, there are two signal lines that are introduced during the transmission. The noise signal is consistent. The inverse of the balanced interface can cancel out the introduced noise, so the sound fidelity and signal-to-noise ratio can be guaranteed, not balanced. There is only one signal line in the transmission. In the long-distance or interference transmission, the noise will be transmitted to the interface end with the signal. Therefore, there is no way to reduce the signal-to-noise ratio. The balanced connection has strong anti-interference ability, and the transmission loss is small. The noise ratio loss is small.
Relatively speaking, the unbalanced line is easily interfered. The balanced and unbalanced interfaces can also be docked. The unbalanced ground and cold wires are connected to the cold wire end, and the hot wire is connected to the hot wire. The same can be used, but the anti-interference is poor.
Generally speaking, the balance line is more expensive, and the occasions used are high-end power amplifiers with balanced terminals and balanced amplifier circuits or high-precision professional power amplifiers.
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