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I've heard from quite a few pretty reliable sources that most CD-Rs come out of the same handful of factories and get split into batches - the CDs aimed for the more expensive brands (TDK, Sony etc) have more out of each batch tested than the cheaper ones... that's the only difference between them.
On the "what speed to burn" front, 8x speed tends to do the job fine. As Nem says, the slower you burn, the deeper the pits are so the less likely you are to get a read error... CD players can recover no problem from a few read errors a second, they just re-read that bit and get on with it. The problem comes when it fails to read the same section correctly several times and it ends up skipping.
Even if CDs burnt at 48x speed work fine for you at home on your new CDJ200s etc, you've got to remember that older CD decks have got less advanced error recovery systems, plus the effect of 5 years' wear & tear and the however many cubic feet of smoke machine smoke, cigarette smoke & ash, etc that have been through club installations CD players and you'll find that CDs are more likely to skip when you're playing out - exactly when you don't want them to.
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Stu Cox | 

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