Mixing vs mastering: what's the difference

They're two words that appear together on almost every music-production site, and yet they're frequently confused. Mixing and mastering are different processes, with different goals, working on different materials. Confusing them leads to bad decisions: sending the wrong file, asking for the wrong service or expecting the master to fix something that should have been resolved earlier.

This guide explains them plainly: what each one does, what order they go in and when you need one, the other, or both.

What is mixing?

The mix is the process of combining all the individual tracks of a recording into a single stereo file. When you record a song, you have dozens of separate tracks: the drums across several mics, the bass, the guitars, the keyboards, the lead vocal, the backing vocals. Mixing is the work of making all of that sound like one coherent thing.

The mix engineer works on the individual tracks and adjusts:

• Balance and levels. How loud each element sounds relative to the rest. The vocal above the instruments, the bass that's felt but doesn't mask, the drums that drive without dominating.
• Panning. Where each element sits in the stereo field: center, left, right. It creates depth and separates the instruments so they don't compete in the same position.
• EQ and compression per track. EQ shapes the timbre of each instrument; compression controls the dynamics and makes the sound more uniform and controlled over time. Both are applied track by track, with specific decisions for each element.
• Effects. Reverb for a sense of space, delay to add depth, creative effects that are part of the track's sound.

The result of the mix is a stereo file (usually 24-bit WAV) that contains the whole song balanced and ready for the next step. That file is what's handed to the mastering engineer.

What is mastering?

Mastering is the last production step before the music reaches the listener. It works on the finished stereo mix —or on grouped stems in the case of stem mastering— and its function is very different from mixing.

The mastering engineer doesn't touch the individual tracks. They can no longer raise just the vocal or lower the guitar. They work on the final result of the mix with tools that act on the whole: mastering EQ to adjust the global tonal balance, multiband or bus compressors, brickwall limiters to reach the appropriate loudness level for the delivery format.

Their goals are:

• Loudness and output level. Bringing the song to the competitive volume for streaming (with specific LUFS targets per platform) or for vinyl, CD or any other format, controlling true peak to avoid digital distortion.
• Global tonal balance. Fine-tuning the balance of lows, mids and highs of the full mix so the track sounds good on any playback system: headphones, large speakers, phone, car.
• Consistency across tracks. When there are several tracks (an EP, an album), mastering ensures they flow coherently: no abrupt volume jump between songs, consistent tonal character throughout the project.
• Delivery formats. The engineer prepares the final files in the formats each destination needs: 16-bit WAV with correct dithering for Spotify or Apple Music, Apple Digital Masters if required, a DDP image for the CD plant, files with embedded metadata.

Mixing vs mastering: comparison table

A summary of the key differences between the two processes. They're complementary, not interchangeable.

Why the order matters

Mixing always comes first. Mastering always comes after. There's no way to reverse it, and it's not an arbitrary detail: mastering works on the result of the mix, not on the separate components. If the mix has problems, the master inherits them.

This is the most frequent expectation mistake we see: believing that the master can save a bad mix. It can't. If there's a bass masking the vocal, the mastering engineer can try to reduce the lows globally, but in doing so it also affects the kick, the electric bass and any other element living in that frequency range. Raising the overall volume amplifies the problems along with the parts that work.

Mastering provides the final 10–15% of polish: it gives level, tonal consistency and the correct technical delivery. But that 10–15% can't replace the work that should have been done track by track in the mix. The better the mix arrives, the better the master comes out.

Listen here to the real difference between an unmastered mix and the result after the full process:

If you want to see more comparative examples across different genres, we have a before-and-after mastering gallery with an analysis of what changed in each case.

Common mistakes

Knowing the difference between mixing and mastering helps avoid some mistakes that delay projects or leave the final result disappointing.

Sending the mix with a limiter or bus compression active. It's the most frequent technical mistake. If when you export the mix you have a limiter on the master bus already crushing the signal, the mastering engineer receives a file with no headroom: no dynamic room to work. The mastering limiter needs to be able to act on a signal with margin. The practical rule is to export with at least -3 dBFS of headroom and no processing on the master bus that affects level or dynamics.

Asking for a master when the mix isn't finished yet. Sometimes there's a rush and an "almost finished" mix is sent thinking mastering will cover the gaps. The result is that the master is technically fine but the song sounds incomplete because there were unresolved elements. If the mix isn't ready, the mastering money is money spent too early.

Confusing loudness with quality. A louder song sounds "better" in a direct comparison, but if that volume was achieved by crushing all the dynamics with an aggressive limiter, the result loses punch and tires the ear quickly. A good master isn't the loudest: it's the one that keeps the dynamics intact within the appropriate level for the target platform.

Not specifying the delivery destination. A master for Spotify (typical target: -14 integrated LUFS) is different from a master for vinyl or for YouTube. If you don't say where the song will play, the engineer has to guess, and the delivered file may not be the most suitable for your specific case.

When do you need each one?

You always need mixing if you have the separate tracks of a recording. It's the process that turns the parts into a song. Without mixing there's no material to master. If that's your case, we offer professional online mixing.

You always need mastering if you're going to release the music on streaming platforms, in physical formats or in any professional distribution format. The stereo mix alone isn't optimized for the levels and technical requirements of each platform. For that final step you have our online mastering service.

There are cases where you only need one of the two: if you already have a finished mix and only mastering is missing, or if you have an old master you want to remix. But in most new projects, both go together and in order: mixing first, mastering after.

If you have doubts about exactly what your project needs or how to send the files, you can read our guide on how to prepare and send stems for mastering before contacting us.

Frequently asked questions