There are various types of input/output terminals for professional audio equipment, such as unbalanced, transformer balanced, and differential balanced. The signal can be sent directly between the balancer and balancer, as well as between unbalanced and unbalanced ports. 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 signal unbalanced end and balanced end can be directly connected. The connection method is to connect the hot end balanced end to the signal unbalanced end, connect the unbalanced end of the cold end balanced end on one side to the grounding end, and connect the grounding terminal to the shielding layer of the signal connecting wire. In addition to the power transmission between the 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 professional audio equipment adopts a possible balance method. It also typically provides the ability to balance input and output. Use a 3-wire audio device for balanced signal transmission. The shielding network layer serves as the ground wire, and the other two core wires are the hot end (see positive end) and the cold end (see signal negative end). Due to the equal magnitude and opposite direction of signal currents flowing through the two signal cores, the external electromagnetic interference induced in the transmission line is reduced and counteracted by the input. Sound equipment price

In professional audio equipment, sometimes some household audio source devices are used, resulting in imbalanced output. The synthesizers of Electric guitar, Electric bass, electric keyboard and electroacoustic instrument also use unbalanced output, so it is inevitable that some unbalanced connections will be used for the connection of audio system. One of the two points that requires special attention is the use of imbalanced methods. The length of the connecting cable should be as short as possible, especially when the transmission level is low. If necessary, an amplifier can be installed near the unbalanced output device to level and convert it to balanced output before long-distance transmission, or a transformer can be used to convert the signal to balanced mode for long-term transmission. Due to the use of unbalanced signal transmission in some devices in audio equipment, issues of balanced/unbalanced and unbalanced/balanced conversion have been raised. Sometimes this conversion is not difficult, but sometimes a transformer is needed to better solve the problem.