Mixing vs Mastering: What's the Difference and Do You Need Both?

Horia Stan is a music producer and sound engineer at The One Records in Bucharest, Romania, working on production, mixing, mastering and vocal recording for artists worldwide.

Mixing turns many tracks into one balanced stereo song. Mastering takes that finished stereo file and prepares it for release, so it sounds right on every platform and next to other records. If the song is going on Spotify, Apple Music or anywhere people will compare it to professional releases, you need both. Mastering cannot fix what the mix got wrong.

Quick answer

• Mixing works on the individual tracks: vocal, drums, bass, synths. It sets balance, EQ, compression, space, effects and automation. This is where most of the sound is decided.
• Mastering works on one stereo file. It sets final loudness, tonal balance, peak safety and consistency across a release, then exports the delivery files.
• You can skip neither for a real release. A demo for yourself or a writing session can skip both.
• One engineer or two both work. Two gives you fresh ears. One gives you no handoff gaps. What matters is that someone checks the master against the mix on different systems.

What mixing actually does

A mix starts with a multitrack session. That can be 20 tracks or 150. The job is to make every part sit where the song needs it.

In practice that means:

• Balance. Level and panning for every track, usually with automation so the balance changes from verse to chorus.
• Frequency. EQ so the vocal, kick, bass and pads stop fighting over the same range.
• Dynamics. Compression and saturation so parts feel steady and present without sounding flat.
• Space. Reverb, delay and stereo width to give the song depth.
• Vocal work. On modern pop this is a big part of the job: comping, tuning, timing, aligning doubles and harmonies, de-essing, rides. I wrote up the full vocal side in how the polished Romanian pop vocal sound is made.

The mix is where the decisions live. Is the vocal on top of the track or inside it? Is the kick tight or wide? Does the chorus open up or hit harder? None of that can be undone later in mastering, because by then the song is a single stereo file.

What mastering actually does

Mastering starts where the mix ends: one stereo WAV, usually 24-bit, with headroom left on the peaks.

The mastering stage:

• Sets loudness. It brings the track to a competitive level without crushing it.
• Corrects the overall tone. Broad EQ moves so the song does not sound too dark, too bright or too boomy on other systems.
• Controls peaks. Limiting and true peak safety so the file does not distort when platforms convert it to lossy formats.
• Makes a release consistent. On an EP or album, every track needs to feel like it belongs on the same record.
• Delivers files. Final WAVs, sometimes alternative versions, with the right sample rate and bit depth for your distributor.

Loudness is the part most people get wrong. Streaming platforms normalize playback volume. Per Spotify's loudness normalization guide, the default Normal setting plays music at -14 LUFS, with Loud at -11 and Quiet at -19. Spotify recommends keeping true peak below -1 dBTP, and below -2 dBTP if your master is louder than -14 LUFS integrated.

So a louder master is not automatically louder on Spotify. It gets turned down. What you keep is the density and character the limiter gave you, and what you lose is the dynamics you squashed to get there. The details are in my LUFS guide for streaming and mastering.

Mixing vs mastering side by side

The row that matters most: mastering works on everything at once. If the vocal is too quiet, a mastering engineer can only push the frequencies where the vocal lives. That also pushes every other instrument in that range. The real fix is in the mix.

Do you need both?

It depends on where the song is going.

The common shortcut is skipping mixing and paying only for mastering, often an AI master. That works when the mix is already good. When the mix has balance problems, an AI master makes those problems louder. I compared the options in AI mastering vs a human mastering engineer.

Same engineer or two different ones?

There are two schools of thought here, and both are valid.

Separate engineers. The classic argument: the mastering engineer hears the mix fresh, on a different system, and catches what the mixer stopped noticing after hours on the song. That argument is real.

One engineer for both. The argument here is control. The person who mixed knows exactly why the vocal sits where it does, and can go back into the session to fix a problem instead of working around it in the stereo file. On dense modern pop, where the vocal chain and the master limiter interact, that matters.

My opinion: the number of people matters less than the process. A good mix-and-master by one person still needs a break between stages, a check on different playback systems and a comparison against references. Two engineers who never talk can do worse than one who works carefully.

I usually handle both, along with production and vocal recording when the project needs it. On "Kingdom" by Andreea Bostanica I worked on production and sound design, recording, mixing and mastering in the same project. More on that release on the Kingdom project page.

What each stage costs

Prices vary a lot by market and by engineer. I broke down the real ranges in how much mixing and mastering costs in 2026. The general pattern:

Mastering on its own is usually much cheaper than mixing, because it is a shorter job on one file. That is also why people try to skip mixing. If the budget is tight, spend it on the mix.

How to prepare files for each stage

Most delays in a remote project come from bad files. This is what to send.

For mixing:

• Every track exported as a mono or stereo WAV, same start point, same length.
• Same sample rate and bit depth as your session, ideally 24-bit.
• Plugin effects you consider part of the sound printed, and the dry version alongside them when you are not sure.
• Clear names: "Lead Vox", "BV Harmony High", "808", not "Audio 14".
• Tempo, key and two or three reference songs.

For mastering:

• One stereo WAV, 24-bit, at the session sample rate.
• No limiter on the mix bus, or a printed version without it.
• Peaks with headroom, not touching 0 dBFS.
• References and a note on where the song will be released.

I go deeper on export rules in how I prepare mixes for mastering.

Where I fit in

If you have a recorded song and you are not sure whether it needs mixing, mastering or both, that is exactly the question I answer before any work starts. You send the files and references in writing through the request form. I tell you what the song actually needs, and we agree the scope before anything is booked.

The details are on the mixing and mastering page. Projects start at EUR 500 per song. Average turnaround is 2-3 days per song depending on genre, complexity and vocal takes, and two revision rounds are included. Everything runs async and in writing, so it works from any time zone. Studio sessions at The One Records in Bucharest are available too.

When to do it yourself, and when to hand it off

Doing it yourself is fine when:

• The song is a demo, a pitch or a writing exercise.
• You are learning to mix and the release is low stakes.
• Your mix already holds up next to references and only needs a quick master.
• The budget is zero and the alternative is not releasing.

Hand it to someone when:

• The song is a single you will promote, pitch to playlists or spend ad money on.
• The vocal is the center of the song and it needs tuning, timing and doubles done properly.
• You have mixed it for weeks and can no longer hear it clearly.
• It needs to compete with US, UK or major-label pop releases.

If you are choosing someone, read the 12 questions to ask a mixing engineer before you pay first. If you also want the song built from the ground up, see music production in Romania or the dark pop producer page.

Frequently Asked Questions

What is the difference between mixing and mastering in simple terms?

Mixing combines all the separate recorded tracks of a song, such as vocals, drums, bass and synths, into one balanced stereo file by adjusting level, EQ, compression, effects and space. Mastering takes that single stereo file and prepares it for release by setting final loudness, correcting overall tone, controlling peaks and making it consistent with other tracks and platforms.

Can I master a song without mixing it first?

You can, but the result is usually disappointing. Mastering works on the whole stereo file at once, so it cannot rebalance a buried vocal, tame a harsh snare or fix a muddy low end without affecting everything else. If the mix has problems, mastering makes them louder. Fix the mix first, then master.

Is mastering more important than mixing?

No. Mixing has the bigger effect on how a song sounds, because that is where balance, vocal treatment and impact are decided. Mastering is the final polish and quality check. If you can only afford one stage, a strong mix with a simple master will usually beat a weak mix with an expensive master.

Should the same engineer mix and master my song?

Both approaches work. A separate mastering engineer brings fresh ears and a different listening system. One engineer doing both can go back into the mix to fix problems instead of working around them in the stereo file. What matters more is that the master gets checked against references and on several playback systems.

How loud should my master be for Spotify?

Spotify normalizes playback to -14 LUFS on its default setting, so masters louder than that get turned down. Spotify recommends keeping true peak below -1 dBTP, or below -2 dBTP if the master is louder than -14 LUFS integrated. Many modern pop masters are louder than -14 LUFS for density and character, but pushing loudness past what the song can take costs dynamics without making it louder on the platform.

How long do mixing and mastering take?

Mixing usually takes hours to days per song, depending on track count, vocal editing and revisions. Mastering a single song is a shorter job. With Horia Stan, the average turnaround for a song is 2-3 days depending on genre, complexity and vocal takes, with two revision rounds included.

Can mixing and mastering be done remotely?

Yes. You send the multitrack stems or the stereo mix, plus references and notes, and the engineer sends back versions for feedback. Horia Stan works fully async and in writing with artists worldwide, so time zones do not get in the way, and studio sessions in Bucharest are available for artists who want to record in person.