I am continually amazed at how sound and performance of individual components are affected by interactions of their power supply.I found that where you plug in each component makes ALL the difference.
I was plagued by a recurring problem with my CD player, where the circuits would suddenly quit and put out loud noise.I had to reset it by unplugging. After trying every grounding trick to no avail,I finally cured it by separating the power supply to the tube buffer in my system, from the digital section of my Equi=Tech. It also smoothed out the sound of my CD's significantly.
The lesson there is that the digital power supply must be uncontaminated. I'm sure this is true for all front-end components.With a few other plug-in changes and some passive noise eliminators, I am amazed at the sound improvement. I kick myself for not thinking of this a few years ago.