For example, wires are like roads, and signals are cars. Only when the road surface is in good condition can the car run smoothly. So the importance of wire is self-evident. The following is the audio line expertise I provide for you. Welcome to read and browse.
What effect does the wire have on the audio signal?
The signal line and speaker line are designed to keep the music signal unchanged during transmission. But in practice, ordinary wires are like filters, which have resistance, capacitance, inductance and so on, which will affect the on-off signal, make the signal under-damped in transmission, and lose music information and details. Because of the existence of capacitance and inductance, transmission cable has its special frequency characteristics, that is, it has different time delays (so-called different transmission rates) and presents different impedances to signals with different frequencies, which obviously distorts the signals to a certain extent.
Music signal is not only 50 Hz and 60hz like electric power, but also contains changes of various frequency components in the process of flowing, which not only carries large energy, but also can transmit complex music signals without loss.
What kind of signal does the wire transmit?
1) The standard level signal line refers to the connecting line between the sound source and the power amplifier.
Its transmission level is about 1V, and it is also a shielded transmission line. This cable is the most widely used in the audio industry. Interestingly, wires made of different insulating media and metal materials have a subtle influence on sound quality. Therefore, manufacturers have produced various types of wires to meet people's requirements for different levels of music appreciation. High-grade finished product line adopts nylon braided sleeve coated with antistatic layer, lined with metal shielding sleeve, oxygen-free pure copper as core wire, and gold-plated plug to prevent noise caused by poor contact of plug.
2) Strong signal line refers to the connecting line between the loudspeaker and the power amplifier.
This kind of wire often has no shielding layer. For this kind of wire, the key is to reduce its resistance, because the output resistance of modern power amplifier is very low, so the requirements for speaker wire are also improved, such as selecting ` or more wires with large cross-sectional area. Wires range from pure copper to silver wire, and one of the more expensive speaker wires is oxygen-free copper speaker wire, which is characterized by good conductivity and low resistivity, and the timbre used to reproduce sound is greatly increased.
3) Weak signal line refers to the connection between microphone and preamplifier or between digital audio source and decoder, usually shielded line.
Digital lines belong to this kind of weak signal lines. Because the fax degree and sensitivity of audio equipment have been greatly improved, the requirements for signal transmission are getting higher and higher. But the signal line is used to transmit digital pulse signals or audio AC signals, and its transmission principle is much more complicated than ordinary DC transmission. In addition to the current flowing through the wire, it will also be affected by the resistance of the wire to produce magnetic field, as well as skin effect and phase distortion between high and low frequencies. If the conductor is to transmit the signal with full audio frequency range (20Hz~20kHz or wider) in a balanced and low-distortion way, the design of the conductor should be very strict. Only in this way can the signal be amplified by high fax and the sound be restored by the speaker.
What is a good wire?
1) Good contact and durability after repeated plugging and unplugging.
Poor contact can easily lead to deterioration or even disconnection of sound or image signals, which is by no means acceptable to consumers. When we use all kinds of audio-visual equipment, it is inevitable that the wires will be unplugged many times for different reasons, such as maintenance, changing the placement position, changing the machine, etc. A high-quality wire, after repeated plugging and unplugging, must not be in poor contact.
2) Very low transmission loss and good shielding performance.
The main purpose of wire is to transmit signals, and its ultimate goal should be to transmit signals truly and completely, rather than signal loss or sound staining caused by the material and structure of wire itself. Therefore, the impedance and capacitive reactance of a good conductor should be well matched with the equipment, so that the signal can be transmitted at 100%.
How long is the wire suitable?
1) The length of the horn line should be 2m~2.5m, which is close to the practical length and leaves some room. If it exceeds 5m, the range will be narrowed, the aftertaste and intensity of music will be reduced, resulting in unnecessary waste.
2) When using the hard beam horn wire, don't bend the wire excessively. When using multi-strand horn wire, it is necessary to ensure that the contact surface between the wire and the terminal is large and firm because of the large diameter of the wire.
3) The length of signal line should be 1m~ 1.5m, because most audiophiles think that a little longer signal line is beneficial to sound quality and easy to move and adjust. (Note: For digital lines, foreign HEADFI websites think that the shorter the digital lines, the better. )
4) When using the homemade signal wire, the gold-plated yellow plug is free of welding. When fixed with screws, the pressure resistance is generally 5~50m? When welding is used, the interface resistance is 3M? Next, so it's better to switch to soldering.
Wire index
According to different smelting methods, high-purity copper can be subdivided into OFC oxygen-free copper, LCOFC copper, PCOCC oxygen-free copper single crystal, super PCOCC copper and so on. According to their purity, there are 4N, 5N, 6N, 7N, 8N and so on. , where n stands for 9 (nine, 4N stands for its purity above 99.99% (that is, there are four 9s, called 4n), and so on.
There are too many wires called 6n or 8n in the market, and the most outrageous one is the so-called 9n silver wire. All large copper smelters can produce 4n copper. Further chemical removal of oxygen content and other trace metals can improve the purity, but the instrument may not be able to measure it.
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