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Recorded at Sound Techniques Studio in Chelsea during 1972, John Martyn’s seminal album Solid Air was released in February 1973.
Emotionally intense and hauntingly beautiful Solid Air encapsulates almost every musical genre with ease and accomplishment. The songs are exquisitely crafted fusions of blues, country, folk, jazz and rock, with dazzling guitar, musicianship and outstanding vocals.
1.What is ‘Half-Speed Mastering’?
This is an elaborate process whereby the source is played back at half it’s normal speed and the turntable on the disc cutting lathe is running at 16 2/3 R.P.M. Because both the source and the cut were running at half their “normal” speeds everything plays back at the right speed when the record is played at home.
2.What are the advantages of Half-Speed Mastering?
The vinyl L.P. 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.
3.Are there any disadvantages?
Only two, 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 I 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 (see below).
4.What was the source for this record?
This album was cut from a high-resolution digital transfer from the ¼” analogue masters. The tapes were re-played on an Ampex ATR-102 fitted with custom extended bass response playback heads. 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 you not cut it 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 master tapes for this album were encoded with Dolby A noise reduction. Dolby only ever made a very small quantity of half-speed enabled Dolby A cards, none of which are available to me. Although the technical team at Abbey Road are more than capable of modifying some spare Dolby A cards for half-speed use, to do so would require an intimate knowledge of the expansion circuit in the card which has never been made available outside of the Dolby Company. Finally, 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 damage and general wear and tear. Far better, then, to eliminate the variable of the reply machine, to decode the Dolby noise reduction correctly and to minimise wear of the master by capturing the music digitally at very high resolution using professional converters locked down with stable external word-clocks. To capture from an Ampex ATR-102 with extended bass heads is a far superior method in my opinion.
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
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