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Separation

regaelicit-aux-separation



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.

The situation gets a bit more complicated if the crosstalk signal is distorted. Audibility and sound quality degradation then depends upon the distortion structure and correlation with the stimulus, in this case the music. Usually, even if bleed through is distorted correlation is good and the crosstalk signal not a major source of quality degradation.





rs-upl


HOW WE MEASURE IT

A 1kHz sine wave is fed to one channel and at half volume and around 4V outputĀ  the residual is measured in the other channel with a spectrum analyser, in order to measure the signal and avoid noise. High values of channel separation are difficult to measure accurately because of bleed across any switch used across the channels, and because it can be degraded by test bench earthing arrangements. We use special stacked wafer switches, electromagnetic screening and balanced connection to floating loads to get an accurate reading.

 

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