Why does the copy sound better than the original

Just purchased Alanis Morissette's recent CD "havoc and bright lights", great recording. I decided to back it up to a lightscribe disk and found the copy to sound better in many respects to the original, I'm at a loss to understand why? My CDP is a Cambridge azure 840c that was recently serviced, the repair included Caps, new drive and firmware update to V1.2. Has anyone else experienced this before where the copy sounds better than the original? Thanks - Rpg