Mixing vs mastering, explained without the jargon: what each stage actually fixes, what it cannot, and why mastering is not just making a track loud.
A band sends over a rough mix and asks whether it is ready for mastering. Nine times out of ten the honest answer is no, it is ready for another mix. The vocal is buried, the guitars are elbowing each other, and the snare has quietly left the building. No amount of final polish will unpick that.
Which is why mixing vs mastering is one of the most asked questions in home recording. The two stages sit right next to each other, they both happen after the playing is finished, and both get described as 'making it sound good'. They are not the same job at all.
What mixing actually does
Mixing is where a pile of separate recordings becomes one piece of music. The engineer opens a session with anything from eight to eighty tracks in it: kick, snare, four tom mics, two guitar amps, a DI, a bass, three vocal passes, a tambourine somebody insisted on.
The job is to decide what the listener hears first, second and third. Levels, panning, EQ, compression, reverb, delay, automation, edits. Hundreds of small choices that add up to a point of view about the song.
A mixer can move things. Turn the guitars down in the chorus so the vocal lands. Carve out the low mids so the bass and the kick stop wrestling. Push the second verse up half a decibel because the singer pulled back. That is all still on the table because the parts are still separate.
What mastering actually does
Mastering starts when the mixing is finished and there is one stereo file. One file in, one file out. That constraint is the entire point.
The mastering engineer sets the overall tonal balance, sorts the loudness, and makes the record behave consistently everywhere: car speakers, laptop, phone on a kitchen counter, a club rig. On an album they also handle the running order, the gaps between tracks, the fades, and the file formats and metadata each platform wants.
The other half of the job is less technical and more valuable. A mastering engineer is the first pair of ears on the record that has not heard it four hundred times. After three weeks of mixing you cannot hear your own low end any more. They can.
Mixing vs mastering: who fixes what
Here is the split, in plain terms.
- •Mixing can fix: a buried vocal, a muddy low end, harsh cymbals, a snare that disappears, a chorus that does not lift, most balance problems.
- •Mastering can fix: a mix that is slightly dull or slightly bright overall, volume jumps between songs on an album, quiet or inconsistent levels, the last five percent of glue.
- •Neither can fix: a bad performance, a weak arrangement, a bass part recorded with a buzzing cable, or a song that has not decided what it is about.
That last line is the one worth tattooing somewhere. Mastering is a finishing stage, not a rescue service. If you are hoping it will save a mix, you are asking a picture framer to repaint the picture.
Why mastering is not just making it loud
The loudness war is over and the streaming platforms won. Most of them normalise playback to a target somewhere in the region of minus fourteen LUFS, give or take, which means a master squashed to within an inch of its life gets turned down to sit alongside everything else.
So you keep the flattening and lose the loudness. A well judged master often sounds bigger at the same playback volume precisely because it left the transients alone. Loud is easy. Loud and still breathing is the craft.
What to send, and to whom
For a mix, send the full multitrack: consistent file names, all starting from the same point, nothing clipping, a tempo map if there is one, plus your rough mix and a reference track or two so the engineer knows what world you are in.
For a master, send one stereo file per song, at the session sample rate, twenty four bit, with a couple of decibels of headroom and no limiter slammed across the mix bus unless that squash is genuinely part of the sound. Include notes about the order and the gaps.
Budget-wise, both are usually priced per song, and mastering is typically the cheaper of the two by a good margin. If money is tight, spend it on the mix. That is where the difference is audible from across the room.
The same two stages, in the game
We built this split into Road to Headliner because it is how records really get made. Songs move through writing, demo, polish and studio work rather than appearing finished from one button press, and each stage feeds a different part of the final quality score. The music pipeline section of the guide walks through the order, and if you want the maths behind it we wrote up how we score song quality in a dev diary. The practical trade-offs are covered in demo versus album recording.
Get the mix right and the master is a pleasure. Get the mix wrong and the master is damage control that nobody enjoys paying for.
If you want to run that whole chain without booking a single studio day, start a band free in your browser and take a song from a rough demo to a finished release. First track written in about five minutes.
