CD Recordings..... What Do U Know?

Way back when Stereophile ran one of the their first shows at the Waldorf in N.Y. someone by the name of Thomas W. Shea with someone from Audio Alchemy were offering free Cd copies of any Cd you wanted. These copies were always better than the original. It was a case of diminishing returns. The worse the original the better the copy. The better the original the less improvement in the copy.

Unsound: That's the same experience I've had. I can make copies of some pretty poorly mass produced CDs that sound much better once I've made the copy. But take a JVC XRCD--I can't make it any better it only gets worse. I used a Genesis digital lens to read the error rate (at least I think that's what it measures). I would play the original, then make a copy and replay it. For those poor quality original CDs the copy had a lower error rate as measured by the digital lens. Now, the ones that were really good to begin with never improved--usually got worse. I have heard that people have used the Genesis digital lens in front of a CD recorder and gotten similar results. I have not done this as my only CD recorder is the one attached to my computer. Perhaps someone else has tried this experiment. So any ideas to what's going on here?

Rives, I've got an intriguing question here:

What if you simply transfer your CD into simple analogue cassette than you won't realy have any jitter issues will you?

Your right that analog tape won't have jitter issues, but I'm not sure I understand how that relates to this thread. I really would like to understand if these error rates can not be corrected through reclocking and re-recording why do I (and apparently a few others) have the experience of copies actually measuring better from an error (and/or jitter) rate. I am not a recording engineer, but will pose this question to the recording engineers I know. In the meantime, if anyone knows the answer to this (and it could be that my method of measuring is completely invalid for some reason--and you really can't correct the problems on the original disc) I would like to know the answer.

Okay, I spoke to a recording engineer that I know. He's forgotten more about this subject than I'll probably ever know, but I will relay what he told me. In the recording process errors occur in producing the glass master from which the final CD is made. The reason we know this is where the errors occur is if you take 3 CDs of the same title and production you will get the same error rates (or extremely close). If you take a mass produced CD and a high quality re-master you are very likely to get a very low error rate on the re-master as opposed to the mass marketed one. He says this is normal. It is caused by clocking errors in producing the glass master. Some production houses are better than others. All DACs make an attempt to correct errors, whether they are caused by jitter or by error in the recording process. Some DACs do a better job than others. Some buffer the information and read the bits on both sides of the error and average them to correct the error. Some simply take the adjacent bit and fill in the error. The process of re-recording the CD can improve the error rate. It will fill the error bits with whatever protocol it uses. The result will be a disc that has a lower error rate. This still leaves a question of is the original better than the copy. The copy now has a lower error rate, but it is just processed the errors and "pre-corrected" them prior to burning the copy. If the protocol for correcting the error in the computer prior to burning the CD is a better protocol than the DAC being used, the result should be a better sounding copy than the original. For example if the computer corrects by bi-interpolation and the DAC uses only adjacent bit correction, then the copy will be better in THAT DAC. In another DAC that uses a superior error correction scheme this might not be the case. Well, I think that answers it. I hope I was clear in translating a recording's engineer's wisdom on the subject.