@audio_phool - the basics are
- if you apply a positive voltage/current through a wire, the insulation will adopt a positive charge
- if you then apply a negative voltage through that same wire, the insulation will adopt a negative charge
- but if you apply an AC signal through a wire, the continuous back and forth from +ve to -ve changes the charge in insulation but not at the exact same time as the frequency of the signal
- the change in the charge held by the insulation lags the AC signal
- during that time lag the signal will encounter some "resitance" due to the insulation having the opposite polarity
- this is where the distortion creeps into the signal
- it is very small, but discernible, even in the most basic system
- the lower the the Dk of the insulation then the faster the polarity of the insulation will change
- and a lower level of distortion will be achieved
- the change in the charge held by the insulation lags the AC signal
- it tends to be more noticeable in the higher frequencies as opposed to the lower frequncies.
These articles may be of assistance
https://www.psaudio.com/article/cables-time-is-of-the-essence-part-1/
https://www.psaudio.com/article/cables-time-is-of-the-essence-part-2/
https://www.psaudio.com/article/cables-time-is-of-the-essence-part-3/
I think there is another article dealing with this topic only that I will try to find
Regards - Steve