Technical term is "crosstalk."
Turning the balance all the way to the left or right is not how to tell. :) The balance control is not meant to go all the way to off, but to give you a range of adjustment for recordings, hearing, and situations when equal loudness is not ideal.
Crosstalk is usually very difficult to avoid it completely in stereo components. Even very good stereo components will not be perfectly free of crosstalk, and when measured may be -60 to -90 dB.
Best,
E
Turning the balance all the way to the left or right is not how to tell. :) The balance control is not meant to go all the way to off, but to give you a range of adjustment for recordings, hearing, and situations when equal loudness is not ideal.
Crosstalk is usually very difficult to avoid it completely in stereo components. Even very good stereo components will not be perfectly free of crosstalk, and when measured may be -60 to -90 dB.
Best,
E