In another thread on cables, I linked an article by the Pink Floyd recording engineers but there's this one statement about digital recordings and making copies:
In my opinion there are a lot of misconceptions about digital audio. Disregarding the good points, some of the bad points are that it is almost impossible to do a digital to digital copy and retain the resolution; it is far more susceptible to the sound changing from many different reasons – RF, A/C mains, harmonic distortion and fluctuation, physical vibrations, etc., than most people realize. What we have tried to achieve is to get our HD system sounding as good as possible, given the parameters of what it is in the first place. We have spent many days listening and testing. Accordingly, every area of improvement has been implemented to the highest degree: all the A/C mains, audio cabling, digital cabling, anti jitter boxes, master clocks, physical support of the units, etc.
Granted, that was back in 2005, but it's still relevant today.
All the best,
Nonoise