Mastering, a form of audio post-production, is the process of preparing and transferring recorded audio from a source containing the final mix to a data storage device (the master); the source from which all copies will be produced (via methods such as pressing, duplication or replication). Recently, the format choice includes using digital masters although analog masters, such as audio tapes, are still being used by the manufacturing industry and by a few engineers who have chosen to specialize in analog mastering.
In order to make a deterministic process, mastering requires critical listening; therefore, it cannot be achieved without the presence of a mastering engineer. There are software mastering tools available to facilitate this last step, but results still depend upon the accuracy of speaker monitors. In addition, "music mastering" engineers may also need to apply corrective equalization and dynamic enhancement in order to improve upon sound translation on all playback systems.
>The studio<
The music mastering studio is very different from a normal audio recording studio. In fact, all the equipment and gear found in most recording and mixing studios can actually hinder the acoustics of a room to accurately monitor sound. Thus, the correct room acoustics and arrangement of the equipment inside a mastering studio is an important factor since the mastering engineer (ME) needs to hear each mix in detail. This room design should be non-environmental or with a minimum room interference. By working with an experienced mastering engineer, the recording artist is also open to alternative opinions and technical advice.
>Process<
The source material, ideally at the original resolution, is processed using equalization, compression, limiting, noise reduction and other processes. More tasks, such as editing, pre-gapping, leveling, fading in and out, noise reduction and other signal restoration and enhancement processes can be applied as part of the mastering stage. This step prepares the music for either digital or analog, e.g. vinyl, replication. The source material is put in the proper order, commonly referred to as assembly (or 'track') sequencing.
If the material is destined for vinyl release, additional processing, such as dynamic range reduction, frequency dependent stereo–to–mono fold-down and equalization, may be applied to compensate for the limitations of that medium. Finally, for compact disc release, Start of Track, End of Track, and Indexes are defined for disc navigation. Subsequently, it is rendered either to a physical medium, such as a CD-R or DVD-R, or to a DDP file set, the standard method of secure delivery for CD and DVD replication masters. The specific medium varies, depending on the intended release format of the final product. For digital audio releases, there is more than one possible master medium, chosen based on replication factory requirements or record label security concerns. Regardless of what delivery method is chosen, the replicator will transfer the audio to a glass master that will generate metal stampers for replication.
The process of audio mastering varies depending on the specific needs of the audio to be processed. Mastering engineers need to examine the types of input media, the expectations of the source producer or recipient, the limitations of the end medium and process the subject accordingly. General rules of thumb can rarely be applied.
Steps of the process typically include but are not limited to the following:
Transferring the recorded audio tracks into the Digital Audio Workstation (DAW) (optional).
Sequence the separate songs or tracks (the spaces in between) as they will appear on the final release.
Process or "sweeten" audio to maximize the sound quality for its particular medium (e.g. applying specific EQ for vinyl)
Transfer the audio to the final master format (i.e., CD-ROM, half-inch reel tape, PCM 1630 U-matic tape, etc.).
Examples of possible actions taken during mastering:
Editing minor flaws
Applying noise reduction to eliminate clicks, dropouts, hum and hiss
Adjusting stereo width
Adding ambience
Equalize audio across tracks
Adjust volume
Dynamic range expansion or compression
Peak limit
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