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From the campaign email:
"Exile on Main St has never sounded better on vinyl, and it probably never will...
A limited edition batch of vinyl has been mastered at half speed at the world famous Abbey Road Studios.
Cut from a high-res digital transfer from the best-known analogue source in existence - the original quarter-inch tapes, the process uses custom-built equipment allowing for twice the mastering time, producing the highest quality audio possible.
Each pressing comes in deluxe packaging with an obi strip and a certificate of authenticity from Abbey Road, plus reproductions of the twelve original postcard inserts taken by Norman Seef, art director for the original 1972 pressing of the album."
Half-Speed Mastering at Abbey Road (yt link)
Also :
"4.What was the source for this record?
24bit/96khz digital transfers supplied by the Stones made from original ¼” tapes. This album was cut from a high-resolution digital transfer from the best known analogue tape in existence. Only minimal sympathetic equalisation was applied to the transfer to keep everything as pure as possible. Also, as this was an analogue, vinyl only high quality release, I did not apply any digital limiting. This is added to almost all digital releases to make them appear to be loud and is responsible for “the loudness war” and in almost every case is anything but natural and pure sounding.
5.Why could it not be cut ‘all analogue’?
The biggest variable when cutting from tape is the replay machine. Every individual roller in the tape’s path will have a direct effect on the quality of the audio emanating from the machine. In addition to this, there is the issue of the sub 30Hz low-frequency roll off on an advance head disc-cutting tape machine which in effect will come into play at 60 Hz when running at half speed. In addition to this, there are also some unpredictable frequency anomalies in the 35-38 Hz region with analogue tape that will double up at half speed. These are all problems if you want to hear as originally intended the lowest register of the bass end on a recording. There is also the lesser potential problem of tape weave that effectively increases at lower speeds and leads to less high frequency stability and the possibility of minor azimuth errors. Even if these problems could be overcome, the source tapes for this album are held in an archive in America. The days of shipping precious analogue masters over the Atlantic are long gone. Even if Universal were to break their internal no overseas shipping rule, it would be close to impossible to get insurance cover for the tapes. Also analogue tape becomes degraded with each pass over the replay heads. These tapes are getting old and it is no longer considered good practise to play and play and play precious old original masters for fear of wearing them out. I can completely understand the reasons for the concerns that some people have when cutting classic albums from digital sources. Historically, there have been some horrible digital transfers used as a vinyl cutting source. This has absolutely not been the case with this series. Micro-management of the audio and attention to detail has been the order of the day.
6.Are there any advantages to this working method?
Yes, any problems with the tape can be treated far more accurately digitally than they could be by using traditional analogue techniques. For example de-essing. I can, by clever editing, target just the offending “sss” and leave intact the rest of the audio. Therefore high-hats, bright guitars and snare drums are not affected or reduced in impact. Using an analogue scatter-gun de-esser approach would also trigger the limiter in many parts of the audio that do not need to be worked on. The de-esser cannot tell a bright guitar from bright vocal and will smooth everything out leading to dull guitars or soft snare drums and weak hi-hats. Targeting the “sss” sounds in the vocal as I have done in this series is time consuming but is worthwhile in the pursuit of the very best possible sounding record. Also if there was any damage to the analogue tape (drop-outs and clicks for example) this can by and large be restored using modern digital methods in a way that is unobtrusive and this would be impossible using analogue methods. For the record, none of the albums in this series have been de-noised. Only clicks and drop-outs have been repaired.
Miles Showell – Mastering Engineer, Abbey Road Studios"
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Note: Considering this (no digital limiting applied), it's possible the digital master provided was the one found on the Exile blu-ray which is actually the same as the one on the Japanese SACD - and not the dreadful 2010 "dynamically squeezed" remaster...
Edited 1 time(s). Last edit at 2016-03-01 01:18 by kowalski.