Is Your Mix Ready for Mastering? A Listening Checklist

Your mix sounds exciting at your desk. Then the vocal feels quiet in the car, or the bass seems different through earbuds. Does that mean the mix is wrong—or that you are hearing the playback system?

A useful mix check is a repeatable listening process, not a vote for one favourite speaker. This checklist helps you decide whether your song is ready to book mastering, or still needs work in the mix.

1. Compare fairly before making changes

Pick a reference with a relevant arrangement and explain what you like about it. A sparse acoustic recording is not a helpful loudness target for a dense electronic track.

Bring the reference and your mix to similar perceived playback levels before judging them. A louder reference can make you chase unnecessary processing. iZotope's reference-track guide explains the importance of level matching.

Use the comparison to ask a narrow question—such as whether the vocal feels similarly clear—not to erase the identity of your record. Engineers use references in different ways, as discussed in iZotope's interviews on referencing.

2. Listen to the whole song without stopping

Take notes on the first uninterrupted pass. Does the opening establish the mood? Does the chorus deliver the lift you intended? Can you follow the important words?

Avoid adjusting something every few seconds. That can turn a review into another mixing session before you have heard the song's overall shape.

Write observations rather than diagnoses. “The hook loses impact after the build” is a useful starting point even if you do not know which fader or processor needs attention.

3. Check a small set of familiar playback systems

Try your main setup and one or two familiar alternatives at comfortable levels. Keep the file version the same. If you compare yesterday's mix on headphones with today's revision in the car, you are testing two things at once.

Use a trusted reference on those same systems. Look for a repeated problem rather than trying to make the song sound identical on devices with very different capabilities.

A mono check can also reveal unexpected changes in the balance of stereo material. iZotope includes this among its mixing and mastering utility checks. Mono is a diagnostic view, not a requirement to make the entire production narrow.

4. Turn your observations into a short action list

Use this format:

• Where: the timestamp and section.
• What: the sound or lyric you notice.
• Priority: essential fix or creative preference.

An illustrative note might be: “1:12, chorus: the lead lyric becomes difficult to understand when the harmonies enter. Essential.” A second note might be: “2:05, final chorus: could the delay feel more dramatic? Preference.”

Keep one consolidated feedback document so collaborators are not working from conflicting instructions.

5. Decide whether you need mixing or mastering

If individual parts need moving, editing or changing, discuss a mixing revision or mixing service. If you are happy with those relationships and want an overall final polish, mastering is the relevant next conversation.

Do not use a single meter reading as proof that the song is finished. Also check the exported file itself: correct version, full ending, no missing sections and no accidental silence at the start.

Prepare the file you send to mastering

Once your listening checks are done, the export itself needs the same care. A good mix can still arrive in a form that limits what mastering can do.

Remove or bypass the final limiter. If you used a limiter or loudness plug-in on the master bus to make the mix sound competitive while working, turn it off for the mastering file. Limiting twice reduces the options at the mastering stage. If a bus compressor or EQ is part of the sound you want, leave it on, and tell the engineer it is there.

Leave some headroom. There is no magic number, but peaks a few decibels below 0 dBFS are a sensible target. The mix should never clip. You do not need to normalise or chase a loudness reading; level is set during mastering.

Keep the session's resolution. Export at the sample rate your project uses, such as 44.1 kHz or 48 kHz. Do not convert it up or down. Use 24-bit or 32-bit float WAV or AIFF. Avoid MP3 or other lossy formats for the master source.

Turn off dither unless you are reducing bit depth. If you export at the session's bit depth or as 32-bit float, dither is not needed at this stage.

Check the start and the end. Leave a short gap of silence before the first sound and let reverb or delay tails ring out fully at the end. Cutting a tail short cannot be undone in mastering.

Name the file clearly. Include the song title, the version and the date, for example "SongTitle_Mix_v3_2026-10-02.wav". If you have more than one version, such as clean and explicit or an instrumental, send each as its own file and say which is the main one.

Write a short note. List your reference track, the release format (streaming, vinyl, video), and any part of the mix you are unsure about. That note helps the mastering engineer understand your goals before they press play.

From the studio: "is it ready?" is the wrong first question

The question I get most from artists is "Is my mix ready for mastering?" I usually turn it around. What are the two things you still feel unsure about? Most people already know. They have heard the vocal drop away in the bridge or the bass get loose in the car, and they hoped mastering would cover it.

I would rather hear about those doubts before the master than after. In more than 15 years, I have found that a five-minute fix in the mix often beats an hour of compromise at the mastering stage.

A recent EDM client is a good example. Their track turned distorted and crunchy every time they pushed it toward commercial loudness, and they could not see why. In the pre-master check, we traced it to a sub-bass with no sidechain, fighting the kick drum and using up the mix's headroom. I asked for cleaner sidechain compression or a volume-shaping curve on the sub so the kick transient could breathe. When the revised mix came back, the limiter stopped pumping, and we reached a clean -6 LUFS with full clarity. The problem needed a mix decision, not more mastering.

Some styles show these gaps faster. A hip-hop record with an 808 that swells on certain notes will expose that on every system. An Afrobeats song with many percussion layers can feel busy once level is added in mastering. In electronic music, the drop needs room to grow, so a mix that is already squashed has nowhere to go.

If your list of doubts is short and specific, you are close. If it is long, take a day away and listen again first.

Want an engineer to help you decide?

Contact Mix & Master Engineers with your current mix and the two or three issues you hear most consistently. Explain which playback systems revealed them. That gives the studio a useful starting point for discussing the right service.

Listen to our before-and-after demos, then review the available packages. You do not need to know the technical solution before asking for help.

Keep reading

• How mixing and mastering differ and when you need each
• Loudness targets for streaming releases
• Electronic music mixing and mastering
• Online mastering for artists in London

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About the author: Charles "DGUNZ" Alison is the lead mixing and mastering engineer at Mix & Master Engineers, with 15+ years of experience across hip-hop, Afrobeats, gospel, R&B, pop and more. He trained at Point Blank Music School (UK), is an approved Apple Digital Masters provider, and has been a Top Rated, Vetted Pro engineer on Fiverr for 6 years, with 2,200+ client reviews. Meet the engineer · Contact the studio