The final and perhaps most subtle aspect of the recording process, mastering involves refining a completed mix and preparing the project for CD replication. It should be noted that professional mastering studios are, in general, completely separate enterprises from recording and mixing studios, utilizing different monitoring systems and hardware costing into the tens- if not hundreds- of thousands of dollars.
If your project has an unlimited budget and is going to be released on a major label, then by all means, stick with a professional mastering engineer and studio! If your project is an independent release with a limited budget, then you may wish to consider this service as a less expensive alternative.
The mastering process involves several steps, the first being achieving an appropriate spectral balance within tracks. This could possibly involve the subtle use of EQ and/or compression in order to maximize dynamics, fill bass response, or tame transient material. The next step is leveling individual tracks' perceived loudness relative to each other, and according to the order in which they will occur on the final project. Once the correct program order and levels have been established, the tracks are assembled in a CD authoring program, assigned track numbers, gap information, and ISRC codes (if necessary) before being burned to CD. |