How to reduce power supply noise.

I'm thinking of improvements inside the CD-DVD players.

What power supply modification? What is done? I think more attention should be on interference and "crosstalk" within the system-certainly the Spectral interview suggested as much. If that "magic"cloth? that was supposed to block RFI & EMI ?? worked I'd wrap everything in it. That cloth didn't seem to work from post here but I imagine there are other things to isolate various digital areas--but what are they? There must be an electronics whiz reading this....

Thanks for info Tvad. I am not considering spending $2000-$3000 on upgrades to my Lexington RT-20; which presently sells for about $1000 brand new. (I have invested that in MIT power conditioning/isolation products and power cords and find every cent well spent. Incredible enhancement to detail, purity, delicacy and dynamics-this RT-20 is a surprisingly musical player in my Spectral/MIT system.)I would like to do mods myself; double shipping money can be spent on parts.
I'm thinking along the lines of perhaps small bypass caps that would be easily installed or perhaps a Bybee product, or isolation for the transformer or anti vibration for the transformer.

Thanks TVAD. Nice someone is on topic.