How to Prep Your Mix for Mastering — The Engineer's Wishlist

Mastering engineers have a category of client we love: the one who sends a clean bounce with proper headroom, three references with specific cues, and a written brief. We also have a category we dread: the one who sends a 16-bit MP3 with the limiter still on, no references, and "make it sound good" in the email body.

The difference is not skill level. It is whether the producer understood what mastering engineers actually need to do their job. This is the wishlist — six prep moves that, if you do them, will get you better masters with fewer revision rounds from any engineer at any price tier.

Mastering does not fix the mix

The first thing every producer needs to internalize before reading the rest of this list: mastering is the final 10%. It is not a rescue mission for a broken mix.

If your low end is muddy, your midrange is fighting itself, your vocal is buried, or your stereo image collapses on mono playback — those are mix problems. A mastering engineer can compensate by 1-2 dB in either direction. Past that, the limiter amplifies whatever is broken in the mix.

Before you prep for mastering, prep for mastering by finishing the mix. Reference it on three playback systems. If something sounds wrong on any of them, fix it now. Mastering will not save you.

Now the wishlist.

1. Pull the master bus limiter (and clipper, and maximizer) off

This is the single most common prep mistake I see, across every genre, every engineer tier, every revision-heavy session. If you ran a limiter or clipper or maximizer on the master bus while mixing — even "just 1 dB of gain reduction for glue" — take it off before you bounce.

Why it matters: the mastering chain starts by adding glue compression, EQ, and saturation before the final limiter. If the bounce already has limiting baked in, the chain double-processes already-compressed audio. The transients flatten. The master sounds smaller than the mix did with the limiter on.

If you have been mixing into the limiter for tonal reasons (some genres need this — modern hyperpop, hardstyle, certain hip-hop sounds), bounce two versions: one with the limiter on for your reference, one with it off for the engineer. Send the dry one.

2. Leave 6 dB of headroom

Your final mix bounce should peak no higher than -6 dBFS. Ideally between -8 and -6 dBFS.

This is not negotiable. Mastering needs room to work. The engineer is going to add gain, EQ moves, compression, and stereo enhancement before the final limiter — every one of those moves changes the level. Starting at -1 dBFS leaves nowhere to work; the master either gets squashed or the engineer has to digitally pull the level down before processing, which is a workflow tax with no creative payoff.

Pull your master fader down until peaks sit around -6 dBFS. Bounce. The engineer will handle final loudness at the master stage.

3. Bounce 24-bit WAV at your session sample rate

Three rules, no exceptions:

Format: WAV or AIFF. Never MP3, FLAC, OGG, or any other lossy or compressed format. Lossy formats strip high-frequency content the mastering chain depends on — once it is gone, no plugin recovers it.

Bit depth: 24-bit minimum. 32-bit float is fine and preferred if your DAW supports it. Bouncing 16-bit forces premature dithering and locks you into a noise floor you cannot improve at the master stage.

Sample rate: matches your session. If you tracked at 48 kHz, bounce at 48 kHz. If you tracked at 44.1, bounce at 44.1. Do not upsample or downsample at the bounce stage — that conversion belongs at delivery, after mastering. Every sample-rate conversion costs a little quality; one conversion at the end is better than two.

4. Listen on three systems before sending

Before you send the bounce, audition it on three different playback systems:

1. Your studio monitors (the room you mixed in)
2. AirPods or any consumer in-ear headphones (what most listeners use)
3. Your phone speaker (the hardest test — exposes midrange problems instantly)

If anything sounds wrong on any of them — a sibilance on AirPods that was not in the studio, a muddy chorus on the phone speaker, a vocal that disappears in the car — fix it before sending. Mastering cannot fix it. It can only amplify it.

This 10-minute check has saved every artist I have worked with at least one revision round. The earlier you catch a problem, the cheaper it is to fix.

5. Send references — with specific cues per reference

A reference track is the single most useful piece of information you can give a mastering engineer. Without references, the engineer is guessing at your aesthetic target. With references, the engineer knows in 30 seconds what "done" looks like in your head.

Send 1-3 commercial references. Spotify or Apple Music links are fine. For each reference, write one sentence on what specifically you want the engineer to match:

• "Match the low end weight of [track]" — you want the bass to hit like this
• "Match the vocal placement of [track]" — vocal sits this far forward in the mix
• "Match the stereo width of [track]" — sense of space
• "Match the loudness of [track]" — your loudness target
• "Match the top-end air of [track]" — high-frequency presence

Without per-reference cues, the engineer has to guess which dimension of the reference you want matched. The cues turn vague references into actionable targets.

Critical: send genre-appropriate references. Do not reference a Billie Eilish track for a hardstyle master. The mastering moves are completely different.

6. Write a real brief — not "make it sound good"

A brief is two or three sentences that tell the engineer what the track is, where it is going, and what matters most.

Bad brief:

"Make it sound good — punchy, loud, professional."

Good brief:

"Melodic dubstep for a Monstercat playlist pitch. Lead synth needs to feel front-and-center; sub-bass needs club translation. Loudness around -9 LUFS. The drop has to hit harder than the verse — that contrast is the whole point of the record."

The good brief tells the engineer the genre, the use case (playlist pitch), the priority elements, the loudness target, and the structural intent. Every one of those data points changes mastering moves.

If you do not have words for any of this, use the references to do the work — but always explain why you picked them. The engineer cannot read your mind.

The 10-minute pre-bounce check

Before you hit bounce, run through this checklist. It takes 10 minutes and prevents the most common revision-causing problems.

1. Master bus limiter / clipper / maximizer off
2. Master fader pulled to leave 6 dB of headroom
3. Bounce settings: WAV, 24-bit, session sample rate, stereo interleaved
4. File named clearly: ArtistName_TrackTitle_v01_24bit.wav
5. References picked + per-reference cues written
6. Brief written (3 sentences: genre, use case, priorities)
7. Listen test on 3 systems
8. Read the engineer's intake form fully before submitting

Done correctly, this becomes muscle memory. You will do it on every track without thinking about it. And you will get noticeably better masters because of it.

What happens when you skip prep

Best case: revision round. The engineer flags the issue, asks for a clean bounce, and you re-send. You lose 2-3 days on the turnaround.

Worst case: the engineer masters what you sent, you sign off without noticing the problem, the master goes out to your distributor, your DSP submission gets rejected for true-peak violations or normalization issues, and you find out a week before release. Now you are re-mastering on a deadline you cannot move.

The prep is not optional. It is the foundation that lets the engineer focus on the creative work instead of damage control.

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Service-specific prep guides:

• Stereo Mastering Prep Guide
• Stem Mastering Prep Guide
• Vocal Mix + Master Prep Guide
• Full Mix + Master Prep Guide

Keep reading:

• What Is LUFS? A Producer's Guide to Loudness for Streaming — what loudness target to bounce to
• Stereo vs Stem vs Full Mix + Master — Which Service Do You Need? — pick the right service tier
• Online Mastering Cost in 2026 — What You Should Pay and Why — the pricing breakdown

If you want a master that comes back right the first time, book a service. Every booking includes a 30-minute onboarding call where we lock the brief together — so the prep work pays off in the master itself.