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When a TRS is used as a single channel connector in a balanced system, it is called a balanced TRS connector. The balanced TRS connector is commonly of the quarter inch type. In professional audio the TRS connector is used for a mono signal to carry balanced audio as opposed to the consumer home electronic world where the same (very simular) connector is used for what is called an unbalanced stereo signal.When a TRS is used as a single channel connector in a balanced system, it is called a balanced TRS connector. The balanced TRS connector is commonly of the quarter inch type and carries a line level signal. In professional audio the TRS connector is used for a mono signal to carry balanced audio as opposed to the consumer home electronic world where the same (very simular) connector is used for what is called an unbalanced stereo signal.