Mastering and production markings explained
Labels such as DDD, 20-bit remaster, DSD mastered, half-speed mastered, SBM and XRCD often describe how a recording was produced. They do not all describe the format stored on the consumer disc.
Why these labels are easy to misunderstand
Packaging mixes together several different layers: recording provenance, mastering precision, noise-shaping systems, disc-manufacturing methods, playback formats and certification marks. A large number printed on a sleeve therefore does not automatically tell you what a CD player is reading.
Useful rule: ask whether a marking describes the source, the mastering process, the manufacturing process, or the actual delivery format.
Digital mastering and provenance labels
| Marking | What it usually describes | What a standard CD still contains |
|---|---|---|
| AAD / ADD / DDD | Analogue/digital stages in the production chain | 16-bit / 44.1 kHz PCM |
| 20-bit remaster | Higher-precision transfer or mastering before delivery | 16-bit / 44.1 kHz PCM |
| 24-bit remaster | 24-bit transfer/mastering precision, not necessarily delivery precision | 16-bit / 44.1 kHz PCM if the release is CD |
| DSD mastered / DSD transfer | DSD used for transfer, editing or mastering at some stage | Still PCM when the product is a conventional CD |
Vinyl production labels
Named mastering and manufacturing systems
Super Bit Mapping (SBM)
Sony noise-shaping/bit-reduction technology associated with making 16-bit delivery from higher-precision digital material.
XRCD / K2
JVC mastering and manufacturing processes intended to control conversion, clocking, bit reduction and glass-master production.
Dither and noise shaping
The underlying concepts behind many high-precision-to-16-bit mastering systems.
Do these markings mean better sound?
Not automatically. They can describe a technically careful process, but they do not tell you the quality of the source tape, transfer, EQ, dynamics processing, editing, pressing or artistic decisions. Two releases carrying the same marking can sound different, and a release without a special badge can be mastered extremely well.
These markings are most useful as provenance and process clues, not as universal quality rankings.