1/18/2024 0 Comments Balanced audio blocks![]() More commonly, devices drive one or both sides of the balanced interface with a signal referenced to ground. Some devices, usually with a transformer output, provide a balanced output that is "floating" with respect to ground the impedance to ground from each side of the output is high. In recording and for short cable runs in general, a compromise is necessary between the noise reduction given by balanced lines and the cost introduced by the extra circuitry they require. Many other components, such as graphic equalizers and effects units, have balanced inputs and outputs to allow this. If the power amplifiers of a public address system are located at any distance from the mixing console, it is also normal to use balanced lines for the signal paths from the mixer to these amplifiers. Microphone interconnections are therefore a common application for a balanced interconnection, which allows the receiver to reject most of this induced noise. Many microphones operate at low voltage levels and some with high output impedance (hi-Z), which makes long microphone cables especially susceptible to electromagnetic interference. This impedance balance permits the balanced line receiver (input stage of the next device) to reject common-mode signals introduced to the two conductors by electromagnetic coupling. However, many balanced devices actively drive only one side of the line, but do so at an impedance that is equal to the impedance of the non-driven side of the line. When used in this manner, each cable carries one channel, therefore stereo audio (for example) would require two of them.Ī common misconception is that balanced audio requires the signal source to deliver equal waveforms of opposite polarity to the two signal conductors of the balanced line. The connectors are usually three-pin XLR or 1⁄ 4 inch (6.35 mm) TRS phone connectors. The balanced interface guarantees that induced noise appears as common-mode voltages at the receiver which can be rejected by a differential device.īalanced connections typically use shielded twisted-pair cable and three-conductor connectors. This type of connection is very important in sound recording and production because it allows the use of long cables while reducing susceptibility to external noise caused by electromagnetic interference. Method of interconnecting audio equipmentīalanced audio is a method of interconnecting audio equipment using balanced interfaces.
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