kerelybonto writes "Not to derail the thread, but why is the mastering done digitally when it requires downmixing (is that the right word?) from 24/96 that is not optimal for the 16/44.1 Redbook format? Is it just because the digital tools are so much easier to use?"
Well Kerelybonto, it's a digital world. DVD-A, SACD, and redbook cd are all digital! I think most people misunderstand what "mastering" entails. It's about as far from a purist persuit as possible. The desire of the average mastering engineer IS NOT to produce the most natural, or accurate sounding recording. It's to produce the subjectively best sounding, most impressive, and (too often), LOUDEST recording...one that stands out in comparison with other material.
In 2002 the most versatile tools for doing this, those which allow the maximum amount of "tweaking" with the minimum amount of added noise and distortion are DIGITAL. The purist argument of analog sounding "purer" simply doesn't matter here. The end product, regardless of how it began, WILL BE DIGITAL! No matter what you may believe the subjective charms of analog to be, it is FAR from a loss free process. EVERY SINGLE PIECE OF ANALOG GEAR IN A CHAIN adds noise, distortion, and it's own particular set of unintended colorations (in addition to the intended ones which led the mastering engineer to use them in the first place). Strap four or five pieces of analog gear together, and unintended artifacts WILL rear their ugly head. It's the nature of the beast. But apply four or five digital processes during mastering (compression, limiting, equalization, harmonic generation, and many others...these are the most common) and if done properly there are no audible artifacts.
Most matering engineers believe that mastering digitally for release on digital media IS the purist approach, or the closest thing to a purist approach that exists in the world of "mastering". Mastering is like making sausage. If you like it (a recording, or a sausage), better not to ask too many questions about how it was made!
Remember when the first cds came out how many people only bought discs which said "DDD"? While I believe that my line of work allows me to know more about exactly what happens during recording, I probably care alot less than most. If a recording sounds good, it sounds good, and I don't particularly care why! I'm very "pro digital". It ELIMINATES or greatly reduces the analog artifacts which most bother ME...wow/flutter, incorrect pitch, hiss, high frequency "self erasure", harmonic distortion, random scrambling of phase/time relationships, etc. Plus digital media have NO INNER GROOVE DISTORTION! I absolutely despise the fact that lps ARE INCAPABLE of sounding as good on the last song on a side as the first...because linear velocity drops steadily as the stylus travels toward disc center. This ALWAYS results in increased, extremely audible (to me) distortion. Imagine an analog tape recording in which the recorder ran at 30ips at the first of the recording, and steadily dropped to 3 3/4 ips at the end. Would an "audiphile" accept such a recording? Of course not! Well friends, this is exactly what happens when playing an lp.
Off topic I know, but I can't point out what's wrong with analog (and there is plenty!) without mentioning it.
But while there are many things wrong with analog, digital certainly isn't perfect either. BOTH are capable of stunningly good, and horribly bad results. I repeat, if a recording sounds good (if a sausage tastes good), it IS good!
Someone (sorry I forget who) asked if we wanted to still be listening to cds in 20 years. I don't. But I certainly don't want to replace my cds with discs which look identical to them, and still are subject to wear, mistracking, skipping, etc. I still believe that the (distant) future is solid state! The less distant future is hard-drive based storage. While they may not offer the ultimate in sound quality (although it's far better at optimum settings than any "purist" will admit), portable devices such as the IPOD (to name the favorite, although not MY favorite) allow us to carry our entire music collection (or at least a huge portion of it) in a shirt pocket.
As storage becomes cheaper, the necessity of using ANY data compression on music stored on such devices will disappear. Then these shirt pocket sized devices will be able not only to store an entire music library, but store it in all it's 24/96, or dsd glory! In the future these devices will not only store more music at lower levels of compression, and eventually without compression, but they'll also offer sound quality as good as ANYTHING else available. While all solid state storage of a huge music library is in the distant future, hard drive storage in uncompressed form at very high resolution of a large library is in the very NEAR future. At least if we don't all go ga-ga over devices which wouldn't even allow transfer of our music to such devices!!!!