WHAT IT TELLS US
This is a measure of separation between the signal channels, with stereo, two of them. Ideally signal will not leak from one channel into the other. If it did to the extent that the channels fully mixed then the result would be mono sound. As there is limited separation across the human head, between our ears, of around 20dB, the stereo effect remains right down to low values of separation, and this is the saviour of the LP where channel separation is often as low as 20dB. However, most amplifiers manage at least 60dB across the audio band so loss of stereo through this mechanism is not much of an issue.
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