Power factor correction implementation?

Rzado, power factor correction can be "Immense". Once you hear the dynamics and nuance revealed when power and current are in phase--you will remember it.

Refining the question. Technically, how is the true power versus apparent factor calculated and corrected for, within the player, for differences in the power source in various locations. Is there an automated tracking device,an oscilloscope comparing the waveforms and automatically calculating the the ideal capacitor size? Or?

Thanks Jazz, you mentioned "until the 80's when clean power was universally available". My experience is that power 'clean enough' for high end systems,such as my Spectral/MIT reference level gear is not available in the areas I have lived in. It took very minimal experimentation for me to experience the benefits of improved AC power, in every unit used, from sources to amp. And this in spite of Spectral's attention to internal power supplies. I believe the quality of AC through the Oracle series p/c's made it easier to appreciate improvements wrought from isolators/conditioners.