How is a CD made?
Production processes in a CD production
CD production involves several steps – from the finished master to replication, printing, and packaging. Often, the producer begins by developing the concept for the song. Usually, the artist then writes the lyrics based on the instrumental track provided. For more independent artists, these steps may be performed by the same person. In the following article, we'll explain the CD production process from start to finish.CD mixingtomastering.
In the next step, the engineer and the artist record the instruments of the song as well as all vocals. The producer is always there to ensure that his ideas are implemented. The engineer then mixes the recordings according to the ideas of the artist and artist. If the song is accepted by everyone after the mix, it is passed on to the mastering engineer. Of themastering engineermostly works independently of theArtists and producers as well as fromRecording-Engineer. This person checks and eliminates technical errors in the mix and adjusts the frequency spectrum so that the song sounds equally “good” on as many playback sources as possible.
From master to press-ready DDP image
With the finishedmasteringThe acoustic pre-production stage is complete – but the actual CD manufacturing only begins afterwards. This is because the pressing plant doesn't need loose WAV files, but a standardized format.DDP image(Disc Description Protocol). This image contains the audio data in the correct order, the exact pauses between tracks, and metadata such as CD-Text (artist, album and track title) and optional ISRC codes per track. Learn more on our page about...DDP mastering. Incidentally, a DDP is not necessary for purely streaming releases – it is exclusively a pressing plant format.
Physical replication step by step
In the pressing plant, the CD goes through several stages until the digital image becomes a finished disc:
- Glassmaster:A laser-inscribed glass substrate receives the digital information as microscopic depressions ("pits") and elevations ("lands").
- Electroplating/Stamping:A metal negative stamp is produced from the glass master by electroforming.
- Injection molding:The stamper imprints the data structure into liquid polycarbonate – creating the transparent carrier disc in seconds.
- Metallization:A very thin layer of aluminum is vapor-deposited so that the laser in the player can read the data in a reflected form.
- Protective coating:A UV-cured lacquer seals the aluminum layer against corrosion.
- Oppression:The label is printed directly onto the top surface using screen or offset printing.
Replication or duplication – what is the difference?
Within theReplication (pressing)The described stamper process is used. It is worthwhile for larger print runs (typically from around 300–500 pieces) because the one-time tooling costs for the glass master and stamper are spread over many units – the result offers the highest quality and compatibility. In theDuplicationIn contrast, CD-R blanks are burned and printed. This is faster and cheaper for small quantities, but technically it is a burned rather than a pressed disc.
Printing, booklet and packaging
A finished CD includes more than just the disc: aBooklet(multi-page supplement) thatInlay(Back insert with tracklist) and the packaging – classically the jewel case, alternatively a digipak or a cardboard sleeve. For trade and logistics, aEAN/Barcodeas well as, where applicable, GEMA and LC markings.
Peak's role in CD manufacturing
Peak-Studios is aMastering studio, not a pressing plantWe handle the audio pre-stage: mixing, mastering, and the creation of the pressing-ready file.DDP imagesIncluding track order, pauses, and CD-Text/ISRC. We'll deliver the finished image to you or directly to your pressing plant – the physical pressing will then take place at the replication facility of your choice. If you're planning a vinyl record instead of a CD, you'll find the necessary preparatory stage at [website/store name].Vinyl MasteringYou can submit your project at any time via ourUpload pagesend it to us.
After editing inMastering process if the result goes back to the producer and artist for final acceptance. If this is found to be good, the material is sent to the press shop for reproduction. This is delivered there either as an audio CD or as aDDP image(Disc Description Protocol) or the songs are sent as a wave. Ultimately, different production processes can differ a little. There are artists or producers who only deal with their title for the final acceptance - there are also producers or artists who want to be present in as many production processes as possible in order to bring their ideas a little more in and the production in the direction they want to steer.
How is a CD made?
In two phases: first the audio pre-stage (mastering and creation of the DDP image in the studio), then the physical replication in the pressing plant – from the glass master via the stamper and injection molding to metallization, protective coating and printing.
What is the difference between CD pressing and CD duplication?
Replication uses a stamper derived from the glass master and is cost-effective for larger print runs. Duplication, on the other hand, burns individual blank CDs (CD-Rs) and is faster and cheaper for small quantities.
What is a DDP image and what do I need it for?
A DDP image is the standardized master template for the pressing plant: audio, track order, breaks, and metadata all in one package. It ensures that the CD is pressed exactly as planned.
Do I need a DDP for a streaming-only release?
No. A DDP image is only needed for physical CD pressing. It is not required for streaming platforms like Spotify or Apple Music.
What are ISRC and EAN codes?
The ISRC uniquely identifies individual tracks, for example for billing and identification purposes. The EAN or barcode identifies the physical product in retail. ISRC codes are usually provided by the artist or label.
From what quantity does actual pressing become worthwhile?
As a rule of thumb, duplication is more economical for quantities of around 300 to 500 pieces, because the one-time tooling costs for the glass master and stamper are then spread across many units. For smaller quantities, duplication is usually more cost-effective.
