Line level is the voltage of the audio signal that travels between say the analogue output of a CD player into the Amplifier. The standard for line level is 1V p-p.  Transmitted at 1V the audio signal is more susceptible to picking up RFI or EMI than an audio signal travelling at 25V speaker level unless care is taken with the transmission line - ie the cabling and connectors.

Most domestic equipment use a single pin and shield RCA connector, these are usually found in pairs ie White and Red or Red and Black.  RCA Stands for Radio Corporation of America, and the RCA connector has found it's way into almost every facet of CE (Consumer Electronic) equipment.

This simple method is unbalanced, each interconnect carries 100% of that channels audio signal in phase, and is more susceptible to RFI and EMI than a balanced connection in that any interference that makes its way past the sheilding system will be added to the audio signal and be audible. The charasteric impdeance of an unbalanced audio transmission line is 75 ohms.

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