Mixing vs. Mastering: What’s the difference, and why your song needs both

You’ve recorded a song. The playing is solid, the vocals are on point, and yet, when you play it next to a track on the radio, something feels missing. It sounds smaller, duller, less "finished." That’s not the fault of the recording, and usually not the fault of the song itself. It’s simply missing two stages that happen after all the tracks are in: mixing and mastering.

These two terms are used together so often that it’s easy to think they are the same thing or just fancy names for a single process. In reality, they are two distinct stages with different goals, and sometimes even handled by two different people. Let’s clear things up.

What is mixing?

Mixing is the work done on the individual parts of a song. Every element sits on its own track. If you recorded in a studio, the vocals are on one track, the bass on another, the guitars, and the drum kit, which is usually split into several tracks itself. If you produced an electronic or hip-hop beat on a computer, it’s the same concept, only the tracks are the kick, the 808, the hi-hats, the synths, the samples, and the vocals or rap. Either way, what arrives at the mixing stage is a pile of separate parts, also called stems, that don’t yet communicate with each other.

The role of the mix is to take all these tracks and turn them into a single unit that sounds right. In practice, this involves several types of work:

• Volume balancing between instruments: deciding what will be loud and at the front of the stage, and what will sit in the back to fill out the picture.
• Spatial positioning (panning): where each instrument sits between the left and right speakers, so there is room for everyone and it doesn't become a cluttered mess centered in the middle.
• EQ: adjusting the frequencies of each track so that one instrument doesn't step on another, and each has its own window to breathe in.
• Compression: controlling the volume fluctuations within a track, so that vocals or bass don't jump between being too quiet and too loud.
• Effects: reverb, delay, and anything else that creates depth, atmosphere, and a sense of space.

The goal of all this is clarity. Every word should be heard, every instrument should have its place, and the song should gain height and a sense of completeness. The final product of the mix is a single stereo file: all the tracks are already combined into one balanced track, ready for the next stage.

What is mastering?

Mastering begins exactly where the mix ends. It no longer touches the individual tracks, for the simple reason that they no longer exist as separate components. There is only one file—the finished mix—and the work is done on it as a whole.

What do you do in mastering? You polish the overall picture and prepare it for distribution. This includes overall tonality, meaning a subtle adjustment of the balance between the bass, mids, and highs so that the song sounds good on headphones, laptop speakers, car audio systems, and in playlists. It also includes volume, known as loudness, which is measured in units called LUFS, so that the song stands proudly alongside other tracks and doesn't sound quieter than them.

There is a technical point here worth noting: streaming platforms normalize the loudness of everything they play. Spotify, for example, targets around -14 LUFS according to the ITU 1770 standard, and recommends a true peak maximum of under -1 dBTP. This means there is no point in simply "pushing" a song to be as loud as possible, because the platform will just turn it down. What actually matters is how you reach that loudness without crushing the dynamics, and that is the very core of mastering.

And if it’s an album rather than a single, mastering has another role: ensuring consistency between tracks. It ensures the transition from song to song sounds seamless, and that the loudness and tone sit together like a single cohesive work rather than a collection of files recorded on different days.

Where does each stage fit into the process?

It’s easiest to remember it as a sequence:

Recording ← Editing ← Mixing ← Mastering

First, you create the material, whether by recording in a studio or producing on a computer. Then, you edit and arrange, cleaning up noise and aligning timing. From there, you move to mixing, which works on multiple tracks and combines them into a single stereo file. Only at the end comes mastering, which takes the finished file and gives it that final polish before it’s released to the world.

The logic behind this order is that each stage receives material already prepared for it. You can't do a good master on a file with an unbalanced mix, just as you can't paint a wall before it’s been built.

The common mistake: "One of them is enough"

This is where the most common misconception comes in. People think the two are identical, or that if they’ve done a mix, mastering is a luxury—or conversely, that a good master will "fix" a problematic mix. Both are wrong.

If you skip the mix and jump straight to mastering, there is nothing to work with. Mastering operates on the overall picture, and it cannot separate vocals from bass if they are already glued together in a single file. Vocals that are buried will stay buried. A kick and bass that clash at the same frequency will continue to clash. Mastering is polishing, not rescue.

And if you skip mastering and release the mix file as is, you usually get a song that sounds right only on the system where it was made. As soon as it moves to other headphones or a car, the balance falls apart, and the volume sounds weak compared to every other song on the playlist. The song isn't bad; it’s just not ready to face the outside world.

In short: each stage solves a different problem. Mixing builds the picture from the inside; mastering prepares it for the outside. Skipping one of them means leaving half the work on the table.

Why separate the two stages at all?

You might ask, if everything is happening in the same studio anyway, why not do both in one go? There are two good reasons for this.

The first is a question of perspective. During the mix, the ear gets lost in the small details—in each channel individually—and gets fatigued. Mastering requires a view of the whole picture, and it’s easier to grasp with fresh ears that haven't spent hours inside those same channels. That is why it is often preferred that mastering be done at a different time, and sometimes even by a different person.

The second reason is specialization. Mixing and mastering require different types of thinking, as well as differently calibrated listening environments. A mastering studio is not necessarily the same room where it’s comfortable to mix. Separating the stages allows each to be done under the right conditions, and you can hear that in the result.

This doesn't mean the same person can't do both well. Many engineers do. It does mean you should treat them as two separate stages and give each the attention it deserves.

So, what are you actually ordering?

Now that you’re reaching out to a studio, you know exactly what you need. If you have separate tracks and the song isn't glued together yet, you need a mix. If you already have a finished mix file and it just needs that final polish before upload, you need mastering. In most cases, you’ll want both, in the right order.

At Shtuvia, we have self-service mix and master studios that you rent and work in yourself, without a technician in the room and without a schedule breathing down your neck. Just as we saw earlier, mixing and mastering rely on a proper listening environment, which is why these rooms are acoustically treated with precise monitoring and international-standard equipment, so that what you hear is what you actually get.