Past year I upgraded plenty*, and NOW, my CD playback is spectacular. I mean SPECTACULAR!!!! WHOO HOO SPECTACULAR. Any questions?
* up from 3.6 to 20.7 Magnepan
Up from cheap used DAC to Marantz SA-10 used as DAC
Upgraded all AC duplex (including in power conditioners) to Furutech GTX-D
Upgraded most power cords to Pangea AC14XLAdded PS Audio Noise Harvesters (7) to AC lines and conditioners.
And did I mention CD playback is spectacular.. (so is LP playback btw)