I have a few OLD retail CDs that I believe are defective pressings (the play side looks fine under bright light inspection, no bronzing or rotting), yet, when played on my old CD/DVD players there are constant very audible clicks in the background. Also, using my Plextor DVDRom & EAC, they won't rip correctly either... constant errors. And if you force a rip anyways, the clicks are there. The worst offender is a Japan first pressing of a KISS album (unlistenable) and the seller even confirmed the copy he made before selling it to me was riddled in distortion/clicks.
So, I play these CDs on the Denon 2930 and ... they sound great! The KISS CD still has some minor background noise here and there, but, it's very much improved.
Just ordered 2 Sanyo laser assemblies to hang onto. So far it's all good.