What Is Audio Mixing? A Producer's Plain-English Guide

If you have searched this before, you have probably found three articles that contradict each other.

This covers audio mixing the way it actually works in a session: the mechanism, the numbers that matter, and the decisions that follow from them.

Nothing below is theory for its own sake. Every number here is one you can check on a meter, and every step is one you can run on the next track you open.

Key takeaways

-14 LUFS and -1 dBTP cover most streaming delivery.
24-bit gives 144 dB of range, which is why it is the working standard.
Fix problems at the earliest stage where they exist.
Louder stopped being an advantage when normalisation arrived.

The short answer

Definitions in audio tend to be circular, which is why so many explanations leave you no better off. The useful version explains the mechanism, then the number, then what changes in your session because of it.

The mastering chain in the order each stage assumes.

Where it fits in the signal chain

Nothing in audio production exists on its own. A setting only means something relative to what feeds it and what follows it.

Stage	What it receives	What it hands on
Recording	Acoustic energy	A 24-bit file with headroom
Editing	Raw takes	A comped, timed performance
Mixing	Individual tracks	A balanced stereo file with 3 to 6 dB headroom
Mastering	The stereo mix	A delivery-ready master at the platform target
Distribution	The master	Encoded audio at the listener's device

Problems are cheapest to fix at the earliest stage where they exist. That is the single most useful principle in the whole process.

The numbers worth memorising

-14 LUFS: the streaming loudness target almost everyone converged on.
-1 dBTP: the true peak ceiling that keeps lossy encoding clean.
24-bit: the working standard, giving 144 dB of dynamic range.
44.1 kHz and 48 kHz: music and video delivery respectively.
3 to 6 dB: the headroom to leave in a mix you are sending to mastering.
100 to 120 Hz: the crossover below which stereo content should be mono.

Common misconceptions

Louder is better. It was, before normalisation. It has not been for years.
Higher sample rates always sound better. They help with heavy processing, and do very little otherwise.
Mastering fixes a bad mix. It improves a good mix and exposes a bad one.
Clipping is always wrong. Controlled clipping is a real technique. Accidental clipping is not.
Expensive gear makes the decision. The decision is the decision. The gear executes it.

The mistakes that cost the most

These are not exotic. They are the five things that show up again and again in tracks that almost work.

Judging at a different level each time. Loud always sounds better, so set a monitoring level and leave it.
Solving a balance problem with a plugin. If the fader cannot fix the relationship, a compressor will only make the wrong balance more consistent.
Working only on one system. A mix that only holds together on your monitors is not finished, it is calibrated to your room.
Boosting where you should be cutting. Making something louder to beat a masking problem raises the whole noise floor of the arrangement.
Never bypassing. If you have not compared against the unprocessed version in the last twenty minutes, you have lost your reference point.

Take a break every forty minutes. Ear fatigue does not announce itself, it just quietly moves your idea of what bright means.

How it translates on real systems

Almost nobody hears your record on the system you made it on. The point of every decision above is that it survives the journey.

System	What it exposes	What to check
Phone speaker	No low end at all below roughly 500 Hz	Does the bass line still read from its harmonics?
Earbuds	Exaggerated width and sub, hyped top	Is anything sibilant or fatiguing?
Laptop	Thin midrange-only playback	Is the vocal still intelligible?
Car	Boomy low end and road noise	Does the low end turn to mush at 80 to 120 Hz?
Club system	Everything below 40 Hz, loud	Is the sub mono and controlled?

If it works on a phone and in a car, it works almost everywhere else. Those two are the honest tests.

Frequently asked questions

What is the most important thing to get right with audio mixing?

Tonal balance and translation. A track that holds up on a phone, in a car and on monitors is finished. One that only works on your monitors is not.

What loudness should I target?

-14 LUFS integrated with a -1 dBTP ceiling covers almost all streaming. Go quieter for acoustic and classical material, louder only where the genre genuinely demands it.

How much headroom should the mix have?

Three to six decibels, with no limiter on the mix bus. That gives the mastering stage something to work with.

How do I know when it is finished?

When it holds up level-matched against a commercial reference, translates on several systems, keeps its low end in mono, and your changes have stopped improving it.