Re: Digital Clone
CDs are stamped, and frequently the hole isn't in the centre of the disc. CDRs are burned whilst spinning around the hole in the centre. One theory put forward was that the extra movement of the laser head back and forth as it tried to track an off-centre disc somehow contributed to a poorer sound, be that for physical or electrical reasons.
I am one who has tried this test of copying a CD to CDR and can concur that sometimes there are very obvious differences between the two - and it wouldn't need a well trained ear to hear it.