How does power cord affect a digital frontend?

I don't claim that it doesn't exist, I'm just curious how it happens. I'm not really clear how presence of noise in AC line may affect digital signal. It may affect an analog stage in CDP, but if the data is being transferred via SPDIF interface, the analog stage is not really involved... I realize that digital signal may be affected by 'bad' SPDIF cable, especially if source or/and receiver are not exactly match to SPDIF specification, resulting in jitter. But how jitter may result from AC power even containing some noise, it anyways is converted to DC for a digital stage? The digital signal is "formatted" by crystal oscillator, not by 60Hz wave.

The greatest improvement with digital gear (Sony SCD 777 ES and Esoteric DV-50) has been with the JPS labs Digital AC. (See Art Dudley's article in the April "Stereophile".) It really works. It takes about a week of continuous use to
"break-in", but the improvement is not subtle.

Dmitrydr, I now better understand what you are asking. I suspect that as with all conversions to dc, there are better and worse and that that cords and filters make the conversion easier.

All I can say is that on my Lindemann with a digital as well as analog ac cord, I can hear substantial difference among the cords I use on the digital as well as analog as well as an enormous improvement using the Loricraft balanced power supply.

More opinions?

I agree with SeanandTaylor that the laser mechanism in the CDP is a culprit in interferring with the power that feeds into the rest of the system. That is why it's best to isolate the transport from the rest of the system, and a good PC can help do this.

I am guessing, but I think the material that CDs are made with (the shiny stuff) can attract airborne RFI/EMI which can be transferred to the rest of the system as well either through the power or signal lines. I use a sheet of ERS cut into the shape of a CD to use as a CD mat and works pretty well.