Mixing vs Mastering: What's the Difference and Why Both Matter

Artists sending us a finished song for "mastering" often mean they want it to sound finished and loud — but if the underlying mix has problems, mastering cannot fix them. Understanding what each stage actually does helps you get a better result and avoid paying for the wrong service.

What happens during mixing

Mixing is where individual recorded tracks — vocals, instruments, drums, samples — are balanced against each other. This includes setting relative levels, panning elements across the stereo field, applying EQ to give each element its own space, using compression to control dynamics, and adding effects like reverb and delay to create depth. A good mix should sound balanced and clear on its own, before any mastering happens.

What happens during mastering

Mastering works on the finished stereo mix as a whole, not on individual tracks. It focuses on overall tonal balance, consistent loudness across a release, and making sure the track translates well across different playback systems — phone speakers, earbuds, club systems and car stereos. Subtle final EQ, compression and limiting are used to polish the mix without fundamentally changing its balance.

Why skipping mastering hurts your song

An unmastered mix, even a good one, will usually sound quieter and less polished than a professionally released track when played back to back. Skipping mastering — or trying to "master" a track using only the same tools and ears that just finished mixing it — often leaves obvious loudness and clarity gaps compared to commercially released music in the same genre.

What to send your engineer, and when

For mixing, send raw, unprocessed tracks (or stems) at their original recorded levels, with any reference tracks you like the sound of. For mastering, send the final stereo mix bounce with a small amount of headroom (avoid pushing it to maximum loudness yourself) so the mastering engineer has room to work.

How the two stages work together

Mixing and mastering are sequential, not interchangeable — mixing shapes the song, mastering prepares the finished mix for release. Treating them as one step, or skipping one entirely, is the most common reason independent releases sound noticeably different from professionally produced tracks in the same genre.

We offer both mixing and mastering as separate or combined services at Sundari Records, and we are happy to review a rough mix and tell you honestly whether it is ready for mastering yet.