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Much confusion exists concerning the provenance of the Mercury Living Presence SACDs that Decca Music / Universal Classics released ca. 2004 and 2005. Those SACDs claimed to present, quoting from the back cover, "for the first time, [the] original three-track versions. In addition to [the] direct-to-DSD 3-channel stereo, the disc includes a new DSD stereo, plus the original CD transfer."
According to Tom Fine,
"The 3-channel DSD layer is pretty much a straight transfer (they may have adjusted levels to tones so all channels were the same nominal level off the tape), done in high-rez PCM at Berliner Studios." Note that Tom does not know the hi-res bit and sample rate before conversion to DSD.
"The DSD stereo layer is a new 3-2 mix done at Berliner. They said they referenced the original CDs. Some turned out better than others, I think the last batched turned out very well.
"The redbook CD layer is from my mother's 1990s digital masters, her 3-2 mixes.
"Here's what was different about the non-redbook parts of the SACDs:
"1. Different playback equipment, so different sound coming off the tape. It's a different sound quality from the original equipment that my mother used.I'm not saying better or worse, just different.
"2. The 3-2 mixes were done new for the 2-channel DSD stereo mix. No original team members were involved in the mixing. Some turned out better than others. Again, they were different-sounding.
"3. The digital transfers were done at high resolution PCM, using a completely different chain from what was used for the original CDs. Whether or not that imparted a different sound is a matter of perspective and opinion. To my ears, those are not the main differences I hear between what was done at Berliner and what my mother did.
"What Chesky/HDTracks is selling is PCM audio of the 3-2 mix done by the guys at Berliner Studios."
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Here is further clarificaton from Tom about the Mercury Golden Imports LPs: "Philips engineers made new Dolby-ized 2-channel masters, doing their own 3-2 mix from 3-track tapes. Some of the Golden Imports were also electronically-created stereo releases of original MONO (pre-11/55) masters, and some were made directly from late-era 2-track masters (Corigliano is one that comes to mind immediately)."
Of course, this article is all about the new releases, and establishing that the CDs and LPs are sourced from as authentic an A-to-D mix as possible. But I include this information, for the record, so that collectors are clear exactly what is new, what has gone down in the past, and what they may be spending their hard- or not so hard-earned cash for.