There are various types of input/output terminals for professional audio equipment, such as unbalanced, transformer balanced, and differential balanced. Signals can be sent directly between the balancer and the balancer, between the unbalanced and unbalanced ports, and for higher requirements, the balancer and unbalanced ports need to be connected to each other through special sensors. Converters typically include passive converters, half-voltage converters, and active differential amplifier converters.

If the requirements are not high, the unbalanced signal terminal and the balanced terminal can be directly connected. The connection method is that the balance terminal of the hot terminal is connected to the unbalanced terminal of the signal terminal, the unbalanced terminal of the balanced terminal of one side is connected to the ground terminal, and the terminal of the ground terminal is connected to the signal connection. wire shield. In addition to the power transmission between the power amplifier and the speaker, in order to improve the anti-interference function of the audio equipment and ensure the signal-to-noise ratio, the signal connection of the professional audio equipment adopts a possible balance method. It also generally provides the ability to balance inputs and outputs. Use 3-wire audio equipment for balanced signal transmission. The shielded network layer is used as the ground wire, and the other two core wires are the hot end (see the positive end) and the cold end (see the negative end of the signal). Since the signal currents flowing through the two signal cores are equal in magnitude and opposite in direction, the external EMI induced in the transmission line reduces and cancels the input. Audio equipment price

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In professional audio equipment, some home audio equipment is sometimes used, and the output is unbalanced. The synthesizers of electric guitars, electric basses, electric keyboards and electric acoustic instruments also use unbalanced outputs, so the connection of the audio system will inevitably use some unbalanced connections. One of the two points to pay special attention to is the use of an unbalanced approach. The length of the connecting cable should be kept as short as possible, especially when the transmission level is low. If necessary, an amplifier can be installed near an unbalanced output device, leveled and converted to a balanced output before long-distance transmission, or a transformer can be used to convert the signal to a balanced mode for long-term transmission. Because some devices in audio equipment use unbalanced signal transmission, the problem of balanced/unbalanced and unbalanced/balanced conversion is raised, sometimes this conversion is not difficult, but sometimes a transformer is needed to better solve the problem.