I've been following this blog recently and they have some good tips and tweaks for CD players.
http://bursonaudioblog.blogspot.com/search/label/DIY%20Audio%20%28Tips%20and%20Tweaks%29
Essentially they are offering DIY kits that upgrades various stages of a CD player. They have a super clock that corrects jitter error at the CD reading stage, super regulators that upgrades the power supply stage and burson hd opamps that upgrades the output stage, etc. But the blog also offers some simple and free tips on how to improve a CDP without spending a cent. It's pretty cool.
http://bursonaudioblog.blogspot.com/search/label/DIY%20Audio%20%28Tips%20and%20Tweaks%29
Essentially they are offering DIY kits that upgrades various stages of a CD player. They have a super clock that corrects jitter error at the CD reading stage, super regulators that upgrades the power supply stage and burson hd opamps that upgrades the output stage, etc. But the blog also offers some simple and free tips on how to improve a CDP without spending a cent. It's pretty cool.