CROSSTALK
Text: Crosstalk is a term originated by telephone technicians to describe interference, between two phone calls on adjacent wires. When applied to audio, crosstalk means that some left-channel signal is leaking into the right channel, or vice versa, thereby reducing stereo separation. Commingling of the left and right signals is not wholly avoidable, and is practically unnoticeable if the intruding signal is at least 25 db lower in volume than the signal rightfully belonging to the channel. Crosstalk ismost often stated in terms of stereo separation. A separation of at least -25 db (the higher the negative figure, the better) in the specifications of a cartridge, amplifier, or tuner therefore signifies that there will be no audible crosstalk between the channels.
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Source: 103