The Difference Between Mixing and Mastering

Mixing and mastering are two separate stages that are often confused - or lumped together as a single thing. They're not. They serve completely different purposes, they happen in a different order, and they require a different mindset. Understanding the distinction helps you brief the people you work with and make better decisions about your project.

What Mixing Is

Mixing is the process of combining and balancing all of the individual recorded elements - vocals, drums, bass, guitars, keys, samples, effects - into a single stereo (or surround) output. It's everything that happens between the raw recordings and the final two-track mix file.

A mix engineer works with the full multi-track session. Their tools are volume automation, equalisation, compression, reverb, delay, saturation, panning, and everything else in the signal processing toolkit. The goal is a balanced, coherent record where every element sits in its place and the sum is greater than the parts.

Mixing is where the emotional character of a record is shaped. The same recordings mixed two different ways can produce two completely different-sounding songs.

What Mastering Is

Mastering is the final step before distribution. The mastering engineer receives the finished stereo mix - or stems for stem mastering - and applies final processing to optimise it for playback across different systems and formats.

Mastering typically involves:

• Final equalisation to correct any tonal imbalances in the stereo mix
• Compression and limiting to achieve the appropriate loudness for the release format
• Stereo width adjustments if needed
• Sequencing and spacing if mastering an album (the gaps between tracks, fade-ins, fade-outs)
• Loudness normalisation so the final master translates consistently across streaming platforms
• Format-specific delivery: 16-bit/44.1kHz for CD, hi-res for streaming, specific cutting levels for vinyl

The mastering engineer isn't working with the individual tracks. They're working with the mix as a finished piece of audio. Their job is to make it translate well - to sound consistent and intentional on every playback system.

Why the Distinction Matters

The two stages operate at different scales. Mixing is about the relationships between elements. Mastering is about the whole. This is why they're traditionally done by different people: a mix engineer who's been inside a session for hours loses objectivity. A mastering engineer comes to the mix fresh, on a calibrated system, with a singular focus on the overall picture.

It's also why the mixing stage should deliver a clean, unmastered file. If a mix has been over-limited before the mastering engineer receives it, there's nothing left to optimise.

Do You Always Need Both?

Not always. For demos, rough cuts, or low-stakes projects, a polished mix may be sufficient. But for anything going to streaming platforms, radio, sync licensing, or physical release, mastering is expected. An unmastered release will sound quieter and less polished than everything around it.

For albums and EPs, mastering also ensures consistency across the whole release - that each track sits at a coherent loudness and tonal balance relative to the others.

When the Same Person Does Both

It's increasingly common for mixing and mastering to be handled by the same engineer, particularly for independent releases. This works well as long as the engineer takes a break between the two stages and listens fresh before mastering. The risk is bias - it's hard to hear a mix objectively when you built it.

What matters most is a clear break between the two stages - at least a day away from the mix before sitting down to master. James builds this into every combined project, so the mastering stage starts with genuinely fresh ears rather than ears that have been in the session all day.

How JNP Handles Both Stages

JNP offers mixing and mastering both separately and as a combined service. For most independent releases, having both handled under the same roof works well - there's less handoff friction, and the mastering stage benefits from the context of having been inside the mix. For artists who already have a finished mix from another engineer, standalone mastering is available too.

James's preference when doing both is to take at least a day away from a mix before mastering it. The objectivity you get from that break is worth the wait. If you're looking at both services for your release, get in touch and we'll put together the right package.