Stereo or stem mastering: what does your song need?

Stereo mastering starts with one finished mix

A stereo mix contains the combined performance of all the instruments and effects. Mastering works on that complete signal to refine tone, dynamics, level and translation. It is the straightforward choice when you are happy with the relationships between the voice, drums, bass and other elements.

Processing the stereo file can affect several elements at once. If reducing a bass build-up also thins the vocal, that is a sign of the limits of working on the combined signal. A stereo master should not be treated as a substitute for an unfinished mix.

Stem mastering starts with separate groups

Stems are grouped exports from the same mix. A four-stem delivery might contain drums, bass, music and vocals. This is an example, not a universal rule: the grouping should preserve the production and provide control over the elements that need attention.

With separate groups, the engineer can adjust a vocal against the instrumental or the bass against the drums before the final mastering chain. A stem still contains the processing and instruments printed into it; it does not provide the flexibility of every original track.

Three practical situations

These are illustrative situations, not claims about client projects. The right decision requires listening to your actual mix; a description alone is not enough to diagnose it.

Export stems that belong to the same mix

Use the same start point, sample rate and export length for every stem, including effect tails. Name the files clearly and include the approved stereo mix as a reference. The engineer needs to know how the groups were made and which processing is already printed.

Check the stems together against your reference. Shared sends and nonlinear master-bus processing can mean separately exported groups do not sum exactly like the original mix. Do not silently remove or duplicate essential effects: explain the routing and ask how to deliver them. A limited reference can be useful even when the working files are supplied without final limiting.

Choose the scope, then the package

At Solid Mastering, stereo mastering costs €80 per song. Stem mastering costs €120 for up to four stems or €150 for up to eight. Mixing and mastering is quoted separately. These options describe different work, not a ranking from basic to automatically better.

If you are unsure, send Carlo a rough mix and explain the problem before preparing a large set of files. Agree the grouping, additional versions and deadline first. Typical stereo and stem mastering turnaround is 24–48 hours once the material is complete, subject to confirmation for larger or urgent projects.