Audio converter pro input level3/21/2023 The main problem with consumer equipment is that the input and output signal levels are normally much lower than the level used in professional equipment. With a balanced audio system any interfering signal that get onto the two balanced wires will be cancelled at the end of the wire by “Common Mode Rejection” on the balanced input of the professional equipment. The term balanced refers to a signal transmission system that has two active signals of opposite polarity on the wires and neither one is connected to ground. Professional equipment have balanced inputs and outputs that use a Plus (+) and a Minus (-) conductor with no connection to ground at the ends. ![]() However you must still deal with the mismatch of unbalanced to balanced connections. You can minimize this problem by locating your equipment together at one location and power all the equipment with the same power outlet. These unwanted signals get into the audio because of the grounding at each end of the cable. This ground connected at both ends of the cable can allow ground loop interfering signals to travel on the same wires and in so doing induce 60 Hz and other unwanted frequencies into your audio programming. This mismatch will cause a lower than expected audio level at the modulator that will make for low volume level and a greater amount of noise in the programming, not to mention ground loop hum problems as well.Īn RCA connector by its design is unbalanced, that is it has a center connector and an outer shield that is grounded to the equipment at both ends. In this case a mismatch of levels normally occurs and the input on the next piece of equipment is expecting to see a balanced signal and instead gets a signal with a short circuit on one of its balanced inputs. Take for example when consumer playback equipment with unbalanced RCA output connectors are connected to a professional grade modulator or fiber optic transmitter with balanced input connectors. However the problems start when you try to mix unbalanced connectors with balanced connectors. ![]() Both pieces of equipment are designed for consumer levels and are expecting an unbalanced signal. ![]() While this equipment is reliable, low cost, and high quality it does lack some of the features that are normally included in professional grade equipment that can lead to problems.Īs an example most consumer grade equipment comes equipped with RCA connectors for both the audio and the video inputs and outputs and this type of connector works quite well when both ends of a short cable are connected to matching unbalanced RCA connectors. In some cases the equipment required is only available in consumer grade equipment. In recent years good quality consumer level equipment has found its way into many Broadcast TV and Cable TV systems because of its high quality and low price.
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