Half Speed Mastered Classic Vinyl – The best sound ever?


Abbey Road Studios have teamed up with Universal Music to release special edition versions of six famous recordings…

Using custom-built equipment they created the vinyl at half the usual speed, resulting in the best quality sound ever achieved for these releases. This is only possible as both the source and the cut were running at half their “normal” speeds (thirty three and a third r.p.m.). But don’t worry, everything plays back at the right speed when the record is played at home!

As well as slowing the recording process down, clever mastering of the pitch and other audio techniques are used to create audio Nirvana. All the LPs in the series have been cut from high-res transfers of the best-known analogue source in existence.

The chosen six LPs are John Martyn’s Solid AirExile On Main St. by The Rolling StonesCream with Disraeli GearsThe Police’s Ghost In The MachineSimple Minds’ New Gold Dream and Fire and Water by Free. They are only available to buy direct from TheSoundOfVinyl.com from May 6th. There will also be further releases in the series, so keep checking back with them for more news.

Each pressing comes in deluxe packaging with a certificate of authenticity from Abbey Road.

Miles Showell, Mastering Engineer at Abbey Road talk us through the process…

John Martyn - Solid Air

John Martyn – Solid Air

“The vinyl record is an analogue sound carrier. Therefore the size and shape of the groove carrying the music is directly related to whatever the music is doing at any particular point. By reducing the speed by a factor of two the recording stylus has twice as long to carve the intricate groove into the master lacquer. Also, any difficult to cut high-frequency information becomes fairly easy to cut mid-range. The result is a record that is capable of extremely clean and un-forced high-frequency response as well as a detailed and solid stereo image.

For The Rolling Stones’ album, 24bit/96khz digital transfers supplied by the band made from original tapes. This album was cut from a high-resolution digital transfer from the best known analogue tape in existence.

The Police - Ghost In The Machine

The Police – Ghost In The Machine

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.

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.

The Rolling Stones - Exile On Main St

The Rolling Stones – Exile On Main St

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 the Stones’ album, for example, 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.

Cream - Disraeli Gears

Cream – Disraeli Gears

Traditionally, there are only two drawbacks to this method of mastering; having to listen to music at half-speed for hour after hour can be a little difficult, at least until I get to hear back the resulting cut when it all becomes worthwhile! The other dis-advantage is an inability to do any “de-essing”. De-essing is a form of processing the signal whereby the “sss” and “t” sounds from the vocalist are controlled in order to avoid sibilance and distortion on playback. None of the tools an engineer would ordinarily employ on a real-time cut work at half speed as the frequencies are wrong so the offending “sss” does not trigger the limiter and everything is moving so slowly there is no acceleration as such for the de-esser to look out for. This has always been the Achilles heel of half-speed cutting until now…

Simple Minds - New Gold Dream

Simple Minds – New Gold Dream

Any problems with the tape can be treated far more accurately digitally than they could be by using traditional analogue techniques. This is especially the case with 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, Abbey Road Mastering Engineer.

Free - Fire and Water

Free – Fire and Water