Mastering Preparation Checklist: What to Do Before Sending Files

You’ve spent weeks perfecting your mix. Every instrument sits exactly where you want it, the vocals shine through, and the dynamics feel just right. Now it’s time to send your mix to a mastering engineer.

But wait—one wrong export setting and you could undermine all that hard work. Send files with clipped peaks? The mastering engineer can’t fix that. Export at the wrong bit depth? You’re throwing away audio quality. Forget to include reference tracks? Expect multiple revision rounds.

Here’s the thing: mastering engineers can work magic, but they need properly prepared source material. This checklist covers everything you need to do before hitting that export button.

TL;DR: Remove master bus processing, leave -6dB headroom (peaks at -3dB max), export at 24-bit WAV in your session’s native sample rate, include uncompressed reference tracks, and organize files clearly. Proper preparation saves time, money, and gets you better results.

Why Proper Preparation Matters

Mastering is the final step between your mix and release-ready audio. The mastering engineer optimizes frequency balance, dynamic range, and loudness for your target format—whether that’s streaming, vinyl, or CD.

What mastering can do:

Enhance clarity and separation across the frequency spectrum
Balance loudness across an album or EP
Optimize audio for specific playback systems (streaming, radio, club)
Add subtle width, depth, or polish
Prepare final masters for different delivery formats

What mastering cannot do:

Fix a poorly balanced mix
Repair clipped or distorted audio
Change the balance between individual instruments (they only have the stereo mix)
Save a mix with fundamental problems

The mastering engineer works with your stereo mixdown—they can’t adjust individual tracks or stems unless you specifically provide them. That’s why your mix needs to be as close to perfect as possible before sending it.

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Critical reminder: Mastering is polish, not rescue. If your mix has fundamental issues (vocals buried, kick drum too loud, muddy low end), fix them before mastering. No amount of mastering can fix a bad mix.

Step 1: Reference Your Mix on Multiple Systems

Before you even think about exporting, make sure your mix actually sounds good.

Test your mix on:

Studio monitors (if you have them)
Consumer headphones (AirPods, Beats, etc.)
Car speakers
Laptop or phone speakers
Bluetooth speaker

What to listen for:

Does the vocal sit consistently in the mix across all systems?
Can you hear the bass on small speakers?
Does anything sound harsh or piercing on headphones?
Are the drums punchy and clear, or do they disappear?

This isn’t about making your mix sound perfect on earbuds—it’s about identifying balance issues you might have missed on your primary monitoring system. If your vocals sound buried on three different playback systems, that’s a mix problem, not a mastering problem.

Take notes: Write down what you hear on each system. If you notice consistent issues (muddy low end, harsh hi-hats), go back and fix them in your mix before exporting.

Step 2: Remove All Master Bus Processing

This is the most common mistake producers make when preparing for mastering.

Remove from your master bus:

❌ Limiters (especially brick wall limiters)
❌ Heavy compression or multiband compression
❌ Loudness maximizers
❌ EQ (unless it’s part of your creative sound)
❌ Stereo widening plugins
❌ Tape emulation or saturation (usually—see note below)

Why this matters: The mastering engineer needs headroom and dynamic range to work with. If you’ve already crushed your mix with a limiter, they’re starting with squashed, distorted audio that can’t be undone.

Exception—creative processing: If you’ve used subtle tape saturation, console emulation, or gentle compression as part of your creative vision, it’s usually fine to keep it. Just make sure you’re not smashing the dynamics or pushing into digital clipping.

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Pro tip: If you’re unsure whether your master bus processing is creative or just loudness-chasing, export two versions: one with the processing and one without. Send both to the mastering engineer with a note explaining which you prefer. They’ll tell you which one gives them more flexibility.

A better approach: Instead of processing on the master bus, create a reference version with a limiter to compare loudness to commercial tracks. Then disable that limiter for the final export.

Step 3: Leave Proper Headroom

Headroom is the space between your mix’s peak level and digital zero (0dBFS). This gives the mastering engineer room to apply processing without clipping.

Industry standard headroom requirements:

Peak levels: -3dB to -6dB maximum
Average (RMS) levels: -12dB to -18dB
Never exceed: 0dBFS (digital clipping)

How to check your levels:

Loop the loudest section of your track (usually the final chorus)
Watch your master fader meter
Note the peak level—if it’s hitting -2dB or higher, pull down your master fader
Aim for peaks around -4dB to -5dB

If your mix is too loud: Lower your master fader by 3-6dB. This doesn’t change your mix balance—it just gives the mastering engineer breathing room.

Common question: "Won’t my mix sound quieter than commercial tracks?"

Yes, and that’s completely fine. Your mix is supposed to sound quieter before mastering. That’s literally what mastering engineers do—they bring the loudness up to commercial levels using specialized tools and techniques. Don’t try to compete with mastered tracks at the mix stage.

Step 4: Choose the Right File Format

File format matters more than you might think. The wrong format can degrade your audio quality or cause compatibility issues.

Recommended export format:

File type: WAV or AIFF (lossless)
Bit depth: 24-bit (never 16-bit for mastering)
Sample rate: Your session’s native sample rate (44.1kHz, 48kHz, 96kHz, etc.)
Dither: None (dither is only applied when reducing bit depth)

Why 24-bit?: 24-bit audio provides 144dB of dynamic range compared to 16-bit’s 96dB. This gives the mastering engineer more resolution to work with, especially in quiet sections. The difference is significant when applying subtle processing.

Sample rate guidance: Export at whatever sample rate your session was recorded at. Don’t upsample—if you tracked at 44.1kHz, export at 44.1kHz. If you recorded at 96kHz, export at 96kHz.

Upsampling doesn’t add quality—it just makes the file larger. The mastering engineer will handle any sample rate conversion needed for final delivery formats.

File naming: Use clear, descriptive names:

✅ Artist_Name - Song_Title - Mix_v3.wav
❌ final final FINAL (2) updated.wav

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Pro tip: Never export to MP3, AAC, or any compressed format for mastering. These formats use lossy compression that permanently discards audio information. Once it’s gone, it’s gone—mastering can’t recover it.

Step 5: Export Settings in Your DAW

Each DAW has slightly different export menus, but the principles are the same.

Ableton Live:

File → Export Audio/Video
Rendering sample rate: Match your session
Bit depth: 24-bit
Dither: Off
Normalize: Off
Format: WAV

Logic Pro X:

File → Bounce → Project or Section
File format: WAV
Resolution: 24 Bit
Sample rate: Match project setting
Normalize: Off
Bypass master effects (if needed)

Pro Tools:

File → Bounce to → Disk
File type: WAV
Bit depth: 24 Bit
Sample rate: Match session
Bypass master fader plugins (if needed)

FL Studio:

File → Export → Wave file
Bit depth: 24-bit int
Frequency: Match project
Mode: Full (entire project)
Disable "Normalize" option

Studio One:

Song → Export Mixdown
Format: Wave
Resolution: 24 Bit
Sample rate: Match session
Mono/Stereo: Stereo
Disable master effects (if needed)

Critical settings across all DAWs:

❌ Normalize: Off (this artificially boosts levels)
❌ Dithering: Off for 24-bit exports
✅ File trimming: Make sure your export includes any reverb/delay tails at the end

Step 6: Include Reference Tracks

Reference tracks help the mastering engineer understand your sonic vision.

What to send:

2-3 commercial tracks that represent the sound you’re going for
Tracks from the same genre or vibe
Lossless files (WAV, FLAC) or high-quality streaming (320kbps MP3 minimum)

Why this matters: "Make it sound professional" is vague. "I want the vocal presence of this Billie Eilish track but with the bass weight of this Kendrick Lamar song" gives the mastering engineer concrete targets.

How to present references:

Create a folder with your mix and 2-3 reference tracks
Include a text file explaining what you like about each reference
Be specific: "I love the warm low end" or "Notice how the vocals sit forward but not harsh"

What NOT to say: "Make it sound exactly like this Drake track." Your song isn’t Drake’s song—it has different instrumentation, arrangement, and performance. References should inspire the mastering approach, not be exact templates.

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Pro tip: If you’re mastering an entire album or EP, include one reference track that represents the overall sonic character you want across all songs. This helps maintain consistency.

Step 7: Check for Common Export Issues

Before sending files, do a final quality control check.

Play through your exported WAV file and listen for:

❌ Clipping or distortion: Peaks hitting 0dBFS
❌ Truncated endings: Reverb or delay tails cut off abruptly
❌ Silence at the beginning: More than 1 second of dead air
❌ Phase issues: Mix sounds hollow or thin (check in mono)
❌ Pops, clicks, or glitches: Export errors or plugin automation issues

How to check:

Import your exported WAV into a fresh DAW session
Compare it against your mix session—do they sound identical?
Check the waveform visually—are there any unexpected spikes or dead zones?
Listen in mono to check for phase problems

Mono checking: Many streaming services and some playback systems (like Bluetooth speakers) sum stereo to mono. If your mix sounds thin or weird in mono, you have phase issues that need fixing before mastering.

Step 8: Organize and Label Files Clearly

Mastering engineers work on dozens of projects each week. Clear organization makes their job easier and reduces mistakes.

File organization structure:

/Artist Name - Project Name/
  /Mixes/
    01_Song_Title_v2.wav
    02_Song_Title_v2.wav
    03_Song_Title_v2.wav
  /References/
    Reference_1_Artist_Name.wav
    Reference_2_Artist_Name.wav
  /Notes/
    Mastering_Notes.txt

What to include in your notes file:

Song sequence (if mastering an album/EP)
Reference track explanations
Any specific concerns or goals
Delivery format needed (streaming, CD, vinyl)
Timeline and deadline

Example notes:

Project: Summer EP
Artist: Your Name
Contact: your@email.com
Deadline: March 20, 2026

Song Sequence:
1. Song Title One
2. Song Title Two
3. Song Title Three

Mastering Goals:
- Warm, analog-feeling low end
- Clear, present vocals without harshness
- Competitive loudness for Spotify/Apple Music

References:
- Reference_1.wav: Love the vocal clarity and space
- Reference_2.wav: Notice the warm bass weight

Delivery Needed:
- WAV files for streaming (16-bit/44.1kHz)
- DDP for CD manufacturing
- Hi-res WAV (24-bit/48kHz) for Bandcamp

Special Notes:
- Track 2 has an intentional distorted guitar in the intro
- Please maintain the dynamic contrast in Track 3's verses

Common Mastering Preparation Mistakes

Mistake #1: Mixing While Listening to a Limiter

Why it’s wrong: When you mix with a limiter on your master bus, you’re making mixing decisions based on squashed, limited audio. Your ears adjust to this compressed sound, and you lose perspective on dynamics.

Better approach: Mix with your master fader clean. If you want to A/B against commercial references, create a separate reference chain you can toggle on/off, or simply turn down the commercial track to match your mix level.

Mistake #2: Sending Multiple Versions Without Clear Instructions

Why it’s wrong: Sending "Mix_v1.wav," "Mix_v2.wav," "Mix_v3_final.wav," "Mix_v3_final_revised.wav" without explaining the differences creates confusion. The mastering engineer wastes time figuring out which version you actually want mastered.

Better approach: Send only your final mix. If you absolutely must include alternates (vocal up version, instrumental, etc.), label them clearly and explain in your notes.

Mistake #3: Mastering Before the Mix is Truly Done

Why it’s wrong: Mastering costs money. Every revision round costs more money. If you send a mix for mastering and then realize the snare is too loud, you’re paying for mastering twice.

Better approach: Take a break before finalizing your mix. Come back the next day with fresh ears. Listen on multiple systems. Get feedback from trusted peers. Only send for mastering when you’re genuinely happy with the mix balance.

Mistake #4: Not Communicating Your Vision

Why it’s wrong: Mastering engineers aren’t mind readers. If you want a specific sound, you need to communicate that. Sending files with no context often results in generic mastering that doesn’t match your artistic vision.

Better approach: Include clear notes about your goals, references, and any specific concerns. Professional communication gets professional results.

How Feedtracks Helps with Pre-Mastering Collaboration

Before you send files to mastering, you often need feedback from collaborators, bandmates, or clients. This is where file organization becomes critical.

Feedtracks makes pre-mastering feedback simple:

Timestamped comments: Leave notes at specific points in the mix ("vocal level at 1:45")
Version control: Upload multiple mix versions with clear organization
Waveform visualization: See exactly where in the track people are commenting
Permanent storage: Keep all mix revisions accessible without WeTransfer expirations
Folder organization: Organize by project, song, or mix version

Example workflow:

Export your mix (following this checklist)
Upload to Feedtracks and share with your collaborators
Collect timestamped feedback: "Kick drum too loud at 2:15"
Make revisions based on consolidated feedback
Upload final version and send to mastering engineer

This eliminates the endless email chains of "the vocal is too quiet somewhere in the second chorus I think" comments. Precise, timestamped feedback means fewer revision rounds and a better final mix.

Streamline Pre-Mastering Feedback

Get timestamped comments on your mix with Feedtracks. Upload, share, collect precise feedback—all in one place.

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Frequently Asked Questions

How much headroom should I leave for mastering?

Leave at least -3dB to -6dB of headroom on your master bus. This means your loudest peaks should hit around -4dB or -5dB. The mastering engineer will bring the loudness up to commercial levels using specialized tools.

Should I send a stereo file or stems?

For traditional mastering, send a stereo mixdown. Some mastering engineers offer "stem mastering" where you send grouped stems (drums, bass, instruments, vocals), but this is a separate service that costs more. Unless specifically requested, send a stereo file.

What if my mix is already hitting 0dB on the master?

Pull down your master fader by 6dB and re-export. This doesn’t change your mix balance—it just lowers the overall level to create headroom. If individual tracks are clipping internally, you’ll need to fix those first.

Can I use mp3 files for mastering?

Never. MP3 files use lossy compression that permanently discards audio information. Always export lossless WAV or AIFF files at 24-bit for mastering. The mastering engineer will create distribution formats (16-bit, MP3, etc.) as part of their deliverables.

Should I normalize my mix before sending?

No. Normalization artificially raises the peak level to 0dB, which defeats the purpose of leaving headroom. Export your mix at the levels it was mixed at, with appropriate headroom.

What sample rate should I use?

Export at your session’s native sample rate. If you recorded and mixed at 44.1kHz, export at 44.1kHz. If you worked at 96kHz, export at 96kHz. Don’t upsample—it doesn’t add quality and creates unnecessarily large files.

How do I prepare an album for mastering?

Export each song as a separate WAV file following this checklist. Name files with track numbers (01_Song_Name.wav). Include notes about song sequence and any specific transitions or crossfades you want between tracks.

Do I need different masters for streaming vs CD?

The mastering engineer creates these variations for you. Send your clean mix and specify in your notes which delivery formats you need (streaming, CD, vinyl, etc.). The mastering engineer will optimize masters for each format.

Summary & Next Steps

Key Takeaways:

✅ Remove all limiters and heavy processing from your master bus
✅ Leave -3dB to -6dB of headroom (peaks around -4dB)
✅ Export 24-bit WAV files at your session’s native sample rate
✅ Include 2-3 reference tracks with explanations
✅ Organize files clearly with detailed notes
✅ Test your exported files before sending

Your Pre-Mastering Checklist:

[ ] Reference mix on 3+ different playback systems
[ ] Remove master bus limiter/compression
[ ] Check peak levels (-3dB to -6dB headroom)
[ ] Export 24-bit WAV at native sample rate
[ ] Include reverb/delay tails in export
[ ] Prepare 2-3 reference tracks
[ ] Write clear notes about your vision
[ ] Organize files in labeled folders
[ ] Quality-check exported files
[ ] Send to mastering engineer

Before you send: Import your exported WAV into a fresh DAW session and listen critically. Does it sound exactly like your mix? Are the levels appropriate? Any clipping or artifacts? This five-minute check can save you from costly mistakes.

Proper preparation isn’t just about following rules—it’s about respecting the mastering engineer’s time and giving them the best possible source material to work with. When you send clean, well-prepared files with clear communication, you get better results, faster turnaround, and fewer revision rounds.

Your mix represents hours or weeks of creative work. Don’t undermine it with sloppy export settings or poor organization. Follow this checklist, and you’ll send files the pros are happy to work with.

About the Author: The Feedtracks team helps audio professionals optimize their workflows with cloud storage and collaboration tools designed specifically for music production.

Last Updated: March 2026