Mixing vs Mastering: What's the Difference?

In short

Mixing vs mastering is a question of scope. Mixing balances the separate tracks (vocals, drums, instruments and effects) into one stereo song. Mastering treats that finished stereo mix as a whole, shaping its overall tone, dynamics and loudness for release. Mix first, master second. A balance problem belongs in the mix, because a stereo file can't be pulled apart again.

Mixing vs mastering at a glance

The difference between mixing and mastering, stage by stage

A song usually moves through four stages, and each one hands a different kind of file to the next.

1. Record or produce. You capture or build the parts: vocals, instruments, programmed drums, synths.

2. Mix. You balance those parts against each other and bounce them to one stereo file.

3. Master. You process that stereo file as a single piece, then prepare it for release.

4. Distribute. You send the master to a distributor, a streaming service or a CD plant.

The mixing and mastering difference comes down to the line between stages 2 and 3: many files on one side, one file on the other. In a mix you can still turn the vocal down without touching the drums. After the bounce you can't. A mastering EQ move lifts or cuts everything that sits in that range, and a mastering compressor reacts to the loudest element in the file, whichever that is.

That difference also explains the order. Mastering decisions depend on how the mix sounds, so every mix change after mastering means doing the mastering again. Apple's guide for mastering engineers, Apple Digital Masters, lists equalization, compression and limiting as the main mastering tools. A mix uses the same tools on individual parts, which is why the two stages get confused.

Do you need mixing, mastering or both?

• A song built from several tracks needs a mix. Someone has to set the balance, and nothing downstream can do it for you.
• A release usually needs a master. Nothing in this guide forbids releasing an unmastered mix. You just leave tone, peaks and consistency exactly as they came out of the mix.
• A single stereo file you can't reopen is already mixed. Mastering is the stage still open to you.
• An album needs mastering as a set. The aim is songs that sit together in tone and level.
• A rough demo for friends may need neither. Do the work when the song is going out under your name.

Common mix vs master mistakes

• Trying to fix a bad mix with mastering. A quiet vocal or a muddy low end is a balance problem. The site's own FAQ says that fixing the mix first generally gives you more control than processing the final file.
• Mastering before the mix is finished. If you change the mix afterwards, the mastering decisions no longer fit it. Lock the mix first.
• Leaving a limiter on the mix bus. A limiter that chases loudness uses up headroom and flattens dynamics before mastering starts. Gentle bus compression is a normal mixing choice. A hard limiter is the problem.
• Clipping. In a digital file 0 dBFS is the ceiling. Apple's guide says that pushing past it causes distortion and a loss of dynamic range, and it recommends leaving at least 1 dB of headroom in a master.
• Sending a mix with no headroom. A mix peaking at 0 dBFS leaves a processor nothing to work with and invites clipping.
• Judging by loudness. A louder version often sounds better in a quick comparison, even when it isn't. Compare mixes at the same perceived level.
• Exporting a lossy or low-resolution file. An MP3 is a lossy copy. The site's FAQ notes that converting an MP3 to WAV won't restore lost detail.
• Treating mastering as a loudness button. Loudness is one part of it. Tone, dynamics and consistency matter as much.

How to get a mix ready for mastering

When to use AI Music Mastering after your mix

Use it when the mix is finished and you want to hear a mastered version before you decide. Upload the stereo mix, choose one of eight sound profiles (Universal, Fire, Clarity, Tape, Natural, Spatial, Cinematic or Punch), adjust Intensity and a three-band EQ, and compare the original with the master. Read the Loudness (LUFS) and Estimated true peak (dBTP) figures in the "Audio details & processing report" under the player. Previewing is free, with no sign-in. Mastered downloads need membership.

The tool applies its own limiter, with a ceiling fixed at −1.5 dB, so you don't need one on your mix. Our how to master a song guide walks through EQ, compression and limiting by hand. For what streaming services do to a loud master, see loudness normalization. Spotify's published figures are on LUFS for Spotify, and the LUFS meter page explains the report numbers.

The honest limits

• It can't fix the mix. It works on the finished file as a whole. It can't turn up one vocal or separate two instruments.
• Upload a finished mix, not stems. The tool takes a completed mono or stereo mix, not separate instrument tracks.
• It uses presets, not a trained model. The site's FAQ describes audio-processing presets, rather than a trained AI model. You get eight profiles, Intensity and EQ.
• There are no compressor or limiter controls. You can't set a threshold, a ratio or the limiter ceiling.
• Files are limited. WAV, MP3, FLAC or AIFF up to 200 MB and 10 minutes.
• Not for you if your mix still has balance problems, or you want a human engineer to make creative calls.