SPARS code

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AAD is the SPARS code (highlighted in red) on Madonna's 1990 album, The Immaculate Collection

The SPARS code is a three-position alphabetic classification system developed in the early 1980s by the Society of Professional Audio Recording Services (SPARS) for commercial compact disc releases to denote aspects of the sound recording and reproduction process, distinguishing between the use of analog equipment and digital equipment. The code's three positions refer to recording, mixing, and mastering respectively. The first two positions may be coded either "A" for analog or "D" for digital; the third position (mastering) is always "D" on digital CDs. The scheme was not originally intended to be limited to use on digital packaged media: it was also available for use in conjunction with analog releases such as vinyl or cassette (where the final character would be "A"), but this was never done in practice.

The system was first implemented in 1984. Due to increasing complexity of recording and mixing processes developed over the code's first decade of use, SPARS decided to withdraw endorsement of the code in 1991 because they felt the code was overly simplistic and did not accurately reflect the complexity of typical recording and mixing processes in use at the time. However, many record labels continued to use the code and SPARS decided to re-endorse the SPARS code in 1995.


The three letters of the code have the following meanings:

  • First letter – the type of audio recorder (usually a tape recorder) used during initial recording (analog or digital)
  • Second letter – the type of audio recorder used during mixing (analog or digital)
  • Third letter – the type of mastering used (always digital for CD releases)

There are five types:

  • AAA – A fully analogue recording, from the original session to mastering. Since at least the mastering recorder must be digital to make a compact disc, this code is not applicable to CDs.[1] While it was originally intended that the code could be used for analog releases, which would have the final letter ″A″, this virtually never occurred in practice (RykoDisc apparently released some cassettes coded ″AAA″)[2].
  • AAD – Analog tape recorder used during initial recording, mixing/editing, Digital mastering.
  • ADD – Analog tape recorder used during initial recording, Digital tape recorder used during mixing/editing and for mastering.
  • DDD – Digital tape recorder used during initial recording, mixing/editing and for mastering.
  • DAD – Digital tape recorder used during initial recording, Analog tape recorder used during mixing/editing, Digital mastering.

Since CD is a digital medium, it must be produced from a digital master—therefore the last letter of the code will always be D. Newer LPs stored the music in analog format, yet they were often labeled as DDD, as the recording and mixing/editing were both digital.

As digital tape recorders only became widely available in the late 1970s, almost all recordings prior to this date that appear on CD will be AAD or ADD—having been digitally remastered. This means that the original analog master tape has been converted (transcribed) to digital. It does not always imply that there has been any additional editing or mixing, although this may have taken place.

In practice, AAD was uncommon and DAD was very rare, as many companies (especially the well-known classical music labels) used digital tape recorders (which was not prohibitively more expensive than analog tape recorders) during the editing or mixing stage.

The jewel box booklet and/or inlay of early compact discs included the SPARS code, typically DDD, ADD, or AAD. The typeface Combi Symbols CD includes the two common ways that the code was written on recordings.


Chris Stone and other members of the Society of Professional Audio Recording Services (SPARS) proposed the code with a set of guidelines for CD manufacturers to mark their product with an indication of exactly which parts of the recording process were analog and which were digital.[3]

The SPARS code was first introduced on commercial CD releases by PolyGram in 1984.[4]

SPARS withdrew endorsement of the code in 1991 due to confusion over analog and digital conversions and interfaces; many felt the SPARS code oversimplified and meaningless.[3] However, many labels continued to use it, and in 1995, the organization re-endorsed the code.[3]


Lack of detail[edit]

The main limitation of the code is that it only covers the type of tape recorder used, not taking into account other equipment used in the production of the recording. For example, during the mixing stage (the middle letter in the code) many DDD recordings may have actually been converted from digital to analog, mixed on an analog mixing console, but converted back to digital and digitally recorded, thus earning it a D in the relevant part of the code. In addition to this, many recordings have effects or parts of different recordings added on to them, creating more confusion for the code.

Representation of quality[edit]

Regardless of the quality of the recording, many DDD classical music compact discs typically sold for considerably more than their ADD counterparts of the same work, due to the so-called premium attached to the fledgling digital recording technology. For instance, Herbert von Karajan's recording of Beethoven's Symphony No. 3, an analogue recording in the 1970s that won the Grand Prix du Disque, sold for considerably less than his 1980s digital recording of the same piece, though the newer recording was not particularly critically acclaimed.


These albums with common SPARS codes (AAD, ADD, DDD) are arranged by year of release on CD, where known:

Pre-1984 digital recordings[edit]

Many older recordings previously issued on vinyl were reissued on CD, beginning with the format's commercial introduction in late 1982 (see Digital recording for a timeline). Reissue CDs often only have the original LP's copyright dates on them, so it's not obvious when the CDs were actually made. If they bear a SPARS code, though, the manufacture date was no earlier than 1984. Most of these older recordings were analog, so it's not unusual to see AAD and ADD codes, but occasional examples of digital-recording codes appear on later CD editions, such as these:

  • Paul Davis - Cool Night (1981; first CD Release Feb. 1983; date of CD release with SPARS code (1983)- DDD was the first album which was recorded and mixed fully digitally at Monarch Sound In Atlanta Georgia.
  • ABBAThe Visitors (1981; first CD release Oct. 1982; date of CD release with SPARS code unknown) – DDD
  • Donald FagenThe Nightfly (1982; date of first CD release and CD release with SPARS code unknown) – DDD

Unusual codes[edit]

Different codes for different tracks
  • HB - The End of New Beginnings (Music Cassette) - Hell Breaks (2013) - ADA
  • Kenny RobertsYou're My Kind of People and It Only Makes Me Cry (Forgetting You) (1988; early 2000s CD releases) – DDA/DDD (Digital Recording And Mixing, but initially released only on analog formats.)

See also[edit]


  1. ^ McComb, Gordon; Cook, John (1987), Compact Disc Player Maintenance and Repair, McGraw-Hill, p. 55, ISBN 0-8306-2790-1 
  2. ^ "Interesting SPARS code..." Steve Hoffman Forum. Retrieved 16 July 2018. 
  3. ^ a b c Caldwell, Pete (1999). "SPARS History: 1979–". Retrieved 2012-09-24. 
  4. ^ "Audio/Video Currents". High Fidelity. October 1984. 
  5. ^ Milner, Greg (2009). "Chapter 7: The Story of the Band That Clipped Itself to Death (and Other Dispatches from the Loudness War)". Perfecting Sound Forever: An Aural History of Recorded Music. Farrar, Straus and Giroux. ISBN 978-0865479388.