How to choose wire for public broadcasting

How to select line for public address system

During the construction of the broadcasting system project, people often focus on the related equipment, and ignore the choice of broadcasting transmission cable. In fact, for a broadcast system project, in order to obtain satisfactory sound effects, in addition to being equipped with high-quality broadcast equipment (power amplifiers, speakers, etc.), the quality of broadcast transmission cables also affects the sound to a certain extent. the quality of.

At present, in the construction process of the broadcasting system project, people often follow the "speaker line" mode used by the home audio system to select the transmission cable of the broadcasting system. In fact, there are certain misunderstandings.

In order to distinguish the positive and negative polarities, the "speaker cable" used in the home audio system dyes copper and copper wires wrapped in transparent plastic to two colors of gold and silver. Learn the name of Hong Kong in the market, commonly known as "gold and silver wire". The "gold and silver wire" specifications are based on the number of copper wires wrapped inside.

The "speaker cable" is mainly used in home audio systems. Generally, the length is only 3-5 meters. Therefore, when selecting, you should choose the "speaker cable" that is "thick" and "material" better to improve the signal. Transmission rate and reduce transmission loss.

If the "speaker cable" is used in a public address system, due to the long wiring length, the project cost determines that it is impossible to select a high-grade "speaker cable", and only a low-grade "speaker cable" can be used. The quality of this type of "speaker cable" is relatively poor, and most of them are manufactured by some small factories (workshops) using relatively backward production processes. Users cannot refer to national standards for evaluation and acceptance.

The low-grade “speaker wires” are generally parallel wires, that is, two copper wires wrapped in transparent plastic are arranged in parallel. The principle of electromagnetics tells us that there is a parasitic capacitance between lines between any two parallel lines, and the presence of parasitic capacitance between lines will cause high-frequency components in the transmission signal to bypass. The longer the line, the greater the influence of the parasitic capacitance between the lines . Therefore, it is not suitable to use parallel lines for long-distance transmission of broadcast signals, otherwise it will easily cause unclear treble and stuffiness.

Scientists have found that the twisted pair method can effectively overcome the influence of parasitic capacitance between the wires, so the twisted pair method is widely used in computer network wires and high-end audio wires. With the popularization of twisted pair cable manufacturing process, more and more transmission cables use twisted pair method. Therefore, the public broadcast system should also use twisted-pair broadcast cable for long-distance transmission of broadcast signals.

The outer layer of the twisted-pair broadcast cable is wrapped with a plastic jacket, which can further protect the internal twisted-pair cable, which can avoid the cutting of the wire channel, the bridge frame, and the short-circuit of the internal core wire in the construction project. This is the twisted-pair cable. Sheathed broadcast cable. Therefore, we recommend using twisted-pair sheathed broadcast cables for public address systems.

In addition, on the basis of the twisted-pair sheathed broadcast cable, there is also a twisted-pair sheathed transmission cable with a shielding layer. For large public address systems, we recommend using shielded twisted-pair sheathed transmission cables. Due to the shielding effect of the shielding network, this cable can effectively prevent the radiation effect of the broadcast cable on other cables laid in the same pipe (same line trough), and can strengthen the tensile resistance of the cable, especially suitable for the interior of the weak current shaft of high-rise buildings Laying and outdoor long-distance laying.

In public broadcasting systems, in addition to using twisted-pair cables for broadcast transmission cables, there are certain requirements for their wire diameters. Theoretically, the thicker the wire diameter, the smaller the transmission loss of the line, but the ensuing problem is that the project cost increases and the construction becomes more difficult. Weighing the pros and cons, considering the performance-price ratio, the broadcast transmission cable can be selected according to the following standards:

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