How to Master a Song

Updated May 2026 — Mastering is the final gate between your finished mix and the listening public. Done well, it makes your music translate faithfully on every playback system — from studio monitors to earbuds to a phone speaker in a kitchen. Done poorly (or skipped entirely), even a great mix can feel thin, harsh, or uncommercially quiet next to professional releases. This guide walks through the complete mastering workflow step by step, with specific plugin settings, LUFS targets for every major streaming platform, and the judgment calls that separate polished masters from amateur ones. Deciding whether to master it yourself or pay a professional? See what mixing and mastering a song actually costs.

Before You Master: Mix File Requirements

The quality of your master is hard-bounded by the quality of your mix. No amount of EQ, compression, or limiting can rescue a mix that has fundamental balance problems, phase issues, or clipping on the mix bus. Before loading any mastering plugins, verify your mix file meets these specifications.

File format: Export your mix as a 24-bit WAV or AIFF file. Never master from an MP3 or other lossy format — the encoding artifacts introduced by lossy compression become audible when you apply further processing, particularly limiting. If your DAW supports 32-bit float export (Ableton Live, FL Studio, Logic Pro, Reaper all support this), export at 32-bit float — it preserves maximum numeric precision through the mastering chain and eliminates any risk of clipping during export, regardless of output level.

Sample rate: 44.1kHz for music destined for streaming and CD. 48kHz if the project is being delivered for video, film, or television sync. Mismatched sample rates introduce resampling artifacts, so match your mastering session sample rate to the mix file.

Headroom: Your mix file should peak at no higher than -3dBFS to -6dBFS. This headroom gives the mastering chain — particularly the limiter — room to operate without the input signal already saturating. If your mix is peaking at 0dBFS or hitting the ceiling, lower the mix bus master fader by 4–6dB and re-export. Do not use a limiter or clipper on the mix bus to create headroom — that's removing dynamics before mastering even begins.

Bypass mix bus processing before export: If you're mastering in a separate session (the preferred workflow), bypass any limiting, heavy saturation, or aggressive multiband compression on the mix bus before exporting the file. You want to hand the mastering chain a dynamic, unprocessed stereo file. If you intend to keep subtle glue compression on the mix bus, that's a judgment call — but anything that's heavily shaping the dynamics should come off before export.

Reference tracks: Before you open a single plugin, gather 2–3 commercially released songs in the same genre that represent the tonal balance and loudness you're targeting. Import them into your mastering session at the same level as your mix (or use a reference plugin like Reference 2 or ADPTR Streamliner). You will A/B against these throughout the session. Without references, it's impossible to judge your master objectively — your ears adapt to whatever they're listening to, and what sounds balanced after 20 minutes of solo listening often turns out to be significantly skewed when compared to a commercial release.

For a deeper dive into the listening environment side of this equation, our guide to mixing in headphones covers how ear fatigue and playback system choice affect mastering decisions.

The Mastering Chain: Step by Step

Step 1: Corrective EQ

The first EQ in the mastering chain addresses tonal imbalances in the mix — areas where the frequency spectrum is too heavy, too thin, or uneven. The goal here is surgical correction, not character-adding enhancement. Use a high-quality linear phase EQ. FabFilter Pro-Q 3 is the industry standard for mastering; its spectrum analyzer makes tonal problems visually identifiable, and linear phase mode avoids the phase rotation that minimum-phase EQs introduce at low frequencies. (Note: the FabFilter Pro-Q 4 has since released with improved dynamic EQ integration, but Pro-Q 3 remains common in professional studios.)

How to identify problems: Enable the EQ's spectrum analyzer and play the full mix through to its loudest section. Compare the spectral shape visually and by ear to your reference tracks playing at a matched loudness level. Common corrective issues include:

• Excessive low-mid buildup (200–400Hz): Makes mixes sound boxy, muddy, or congested — especially common in dense arrangements or rooms with poor acoustic treatment.
• Too much sub-bass energy (below 60Hz): Energy below 60Hz is mostly felt, not heard, and consumes headroom without contributing perceived weight on most playback systems.
• Missing upper midrange presence (2–5kHz): Makes mixes sound dull, recessed, or lacking intelligibility — vocals and lead instruments sit too far back.
• Harsh treble (6–9kHz): Makes mixes sound brittle, bright, or fatiguing — often introduced by overuse of digital distortion or aggressive mix compression.

Corrective EQ cuts in mastering are typically narrow (Q of 2–4) and modest in depth (1–3dB). At this stage you're removing specific problems, not reshaping the overall tonal character. If a problem requires more than 3–4dB of correction, it's a mixing problem — go back to the mix.

Step 2: Sub-Bass Mono Control

Apply a high-pass filter to the Side channel of the signal below 80–100Hz using M/S (mid/side) processing. Sub-bass frequencies are naturally mono in virtually all commercially released music — the physics of long wavelengths and typical speaker placement means frequencies below 80Hz don't meaningfully exist in stereo. Side-channel bass creates phase cancellation problems, reduces the perceived weight and punch of the low end, and causes issues in mono playback (club systems, phone speakers, and radio all sum to mono).

In FabFilter Pro-Q 3: Switch to M/S processing mode. Add a high-pass filter at 80Hz on the Side channel only, with a slope of 18–24dB/octave. In iZotope Ozone: Use the Imager module's stereoize function, which applies M/S width adjustment per frequency band — pull the width toward 0% for the lowest frequency band. In Waves Center or Brainworx bx_solo: Solo the Side channel and apply a high-pass filter in another EQ instance before or after.

Step 3: Bus Compression

Mastering compression is gentle. The goal is density, glue, and perceived loudness — not audible pumping or dramatic gain reduction. Think of it as making the mix feel more cohesive and consistent, not louder. You are adding loudness at the limiter stage; compression here is about feel.

Target settings for mastering compression:

• Ratio: 1.5:1 to 2:1 (never above 2:1 in mastering compression)
• Threshold: Set so gain reduction (GR) hits 2–4dB on peaks
• Attack: 30–80ms (slow attack lets transients through before compression engages)
• Release: 100–250ms, or set to auto/program-dependent if available
• Knee: Soft knee (3–6dB) for transparent, musical compression
• Makeup gain: Match the compressed output level to the input level by ear (use the compressor's output gain or a separate gain plugin)

Classic mastering compressor choices include the Waves SSL G-Master Buss Compressor (hardware-accurate emulation of the SSL 4000G bus compressor), FabFilter Pro-C 2 in Mastering mode, the UAD Neve 33609, and the Tube-Tech CL 1B for program-dependent optical character. On the transparent end, the Weiss DS1-MK3 emulation (UAD) is a mastering-specific compressor with extremely clean behavior.

Bypass the compressor and compare. If you can't tell the difference between bypassed and engaged, you may need a touch more gain reduction. If you can immediately identify the compressor sound, pull back the ratio or raise the threshold. The best mastering compression is the kind you notice only when you remove it.

For more on compression theory and ratios, our compression ratio explained guide covers attack, release, and ratio interaction in depth.

Step 4: Tonal EQ

After compression has shaped the dynamics, apply a second EQ pass for character and final tonal shaping. This EQ adds what the track needs to sound finished and competitive — air, warmth, presence, or weight. Unlike corrective EQ, tonal mastering EQ uses gentler curves:

• High shelf boost (10–16kHz, 0.5–1.5dB): Adds air and openness. Use a gentle shelf (not a peak). Neve 1073-style or Pultec-style high shelf has a musicality that modern digital filters often lack.
• Low shelf boost (40–80Hz, 0.5–1.5dB): Adds weight and chest to the low end. Keep it subtle — this range fills up quickly.
• Broad presence dip or boost (1–3kHz): Very gentle — 0.5dB in either direction at 1–3kHz noticeably affects how forward or recessed the mix feels.

A hardware-emulating EQ is valuable at this stage: the Pultec EQP-1A emulation (Universal Audio, Waves, or free variants like DDMF LP10), the Neve 1073, or the API 550 all add harmonic coloration alongside their frequency shaping. That color — subtle harmonic saturation added by the circuit emulation — is part of what makes the tonal EQ stage different from corrective EQ.

Step 5: Stereo Imaging

Apply stereo enhancement carefully and conservatively. Most mixes already have appropriate stereo width — mastering-stage widening is a subtle enhancement, not a transformation. Widening applied incorrectly creates mono compatibility problems, phase issues, and an unnatural, washed-out quality.

Tools: iZotope Ozone Imager (per-frequency-band M/S width control), Waves S1 Stereo Imager, Brainworx bx_stereomaker, or the built-in stereo tools in your DAW's Mid/Side EQ mode. A common approach is to slightly narrow the low-mid range (200–500Hz) while slightly widening the upper mids and highs (2–8kHz). This focuses the mix in the center where it counts while giving the high frequencies space to breathe. Always check your master in mono — if the stereo enhancement causes audible cancellation in mono, reduce or remove it.

Step 6: Saturation

Saturation at the mastering stage adds harmonic density and perceived analog warmth. The gains are subtle — often inaudible on their own, but noticeable when bypassed. Saturation in mastering works by adding low-order harmonics (primarily second and third harmonic distortion) that make the signal feel richer and more three-dimensional without adding gain.

Recommended tools: Softube Tape, UAD Studer A800 (tape emulation with mastering-appropriate harmonic character), Waves Abbey Road TG Mastering Chain, or simply running the signal through a tube preamp emulation at very low drive levels. The key is restraint — drive the saturation plugin until you can just barely perceive a change in density or warmth, then back off 20%. Mastering saturation should be felt rather than heard.

Step 7: Limiting

The limiter is the final processing stage before the loudness meter. It serves two functions: catching true peaks (preventing inter-sample peaks above the ceiling) and achieving target integrated loudness. A limiter in mastering is a specific type of processor — a brickwall limiter, meaning it absolutely prevents any signal from exceeding the ceiling you set, with fast attack times (often sample-accurate).

Recommended settings for mastering limiting:

• True peak ceiling: -1dBTP. This prevents inter-sample peaks from exceeding 0dBFS after digital-to-analog conversion and lossy encoding (inter-sample peaks can exceed 0dBFS even when the sample values don't).
• Target integrated loudness: -14 LUFS for streaming. Drive the limiter until the loudness meter reads -14 LUFS integrated on a full playthrough of the track.
• Gain reduction: 2–4dB GR on peaks is comfortable. More than 6dB of consistent gain reduction from the limiter indicates you're over-limiting and need to reconsider your target loudness or address the mix.

For a complete deep-dive on limiter settings and ceiling choices, see our guide on how to use a limiter.

Recommended limiters: FabFilter Pro-L 2 (highly transparent with multiple limiting algorithms including True Peak, Aggressive, and Bus modes), iZotope Ozone Maximizer (intelligent release algorithm, IRC modes for program-adaptive limiting), Waves L2 Ultramaximizer (classic hardware emulation), Waves L3 (multiband limiting for additional spectral control). The FabFilter Pro-L 2 is the current industry standard for transparent brickwall limiting in mastering.

Step 8: Loudness Measurement

After limiting, play back the full track in real time through a loudness meter to confirm your integrated LUFS reading. The measurement must be taken over the full duration of the track — integrated LUFS is a time-averaged measurement, and spot-checking short sections gives misleading results.

Recommended tools: Youlean Loudness Meter 2 (free, accurate, displays LUFS-I, LUFS-S, LUFS-M, and true peak simultaneously), iZotope Insight 2 (paid, comprehensive, includes phase correlation and stereo field metering), or the LUFS metering built into FabFilter Pro-L 2 directly.

LUFS Targets for Streaming Platforms

Modern streaming platforms apply loudness normalization — they measure the integrated loudness of your track and adjust playback volume to match their target. Understanding how each platform normalizes is essential for making smart mastering decisions.

The mastering conclusion: Master to -14 LUFS integrated and your release will comply with most major streaming platforms. Apple Music normalizes to -16 LUFS, meaning your -14 LUFS master will be turned down by 2 LUFS on Apple Music — this is fine. Never chase loudness beyond the platform's normalization target. A -8 LUFS master sounds identical to a -14 LUFS master on Spotify after normalization, but the -8 LUFS version required far more limiting that damaged its dynamics. The -14 LUFS version will have better transient response, better stereo width, and better low-end clarity.

Spotify also offers a “loud” normalization option (which users can toggle) targeting approximately -11 LUFS. Mastering to -14 LUFS covers both the default and loud normalization behaviors without compromise.

Essential Mastering Plugins and Tools

You don't need an expensive rack of hardware to produce professional masters. A core set of high-quality plugins in a properly treated listening environment will produce results indistinguishable from hardware chains for streaming distribution. Here's what the mastering signal chain requires:

High-quality EQ: FabFilter Pro-Q 3 (or Pro-Q 4) is the standard — its spectrum analyzer, dynamic EQ, and M/S processing make it the most versatile mastering EQ in software. Alternatives include DMG Audio EQuilibrium (used by many dedicated mastering engineers) and Fabfilter Pro-Q 3 in linear phase mode for any EQ applied early in the chain. For Pultec-style tonal shaping, the UAD Pultec EQP-1A or the free Tokyo Dawn TDR VOS SlickEQ Mastering are excellent.

Bus compressor: FabFilter Pro-C 2 (transparent with excellent metering), Waves SSL G-Master Buss Compressor (classic glue compression character), UAD SSL G Bus Compressor, UAD Neve 33609, or the Kush Audio Clariphonic DSP for mid-forward program compression.

Limiter: FabFilter Pro-L 2 or iZotope Ozone Maximizer. These two cover most mastering situations. The Pro-L 2 offers more algorithm flexibility; the Ozone Maximizer's IRC IV algorithm handles transient-heavy music particularly well.

Loudness meter: Youlean Loudness Meter 2 is free and accurate for LUFS-I, LUFS-S, and true peak measurement. For professional delivery, iZotope Insight 2 adds stereo field analysis, spectral balance, and phase correlation metering.

Stereo imager: iZotope Ozone Imager (free version available), Waves S1, or Brainworx bx_stereomaker.

All-in-one option: iZotope Ozone bundles EQ, dynamics, imager, maximizer, and loudness metering into a single plugin suite at multiple price tiers (Elements, Standard, Advanced). Ozone Advanced adds AI-assisted mastering via Master Rebalance and Master Assistant. For a full breakdown, see our iZotope Ozone 12 review.

For AI-assisted mastering alternatives, our comparison of LANDR vs iZotope Ozone covers the tradeoffs between automated AI mastering services and manual DAW-based mastering in detail.

Common Mastering Mistakes (and How to Avoid Them)

1. Mastering a mix that needs more work. Mastering cannot fix a problematic mix. If the mix has phase issues, frequency imbalances requiring more than 3–4dB of correction, or audible clipping and distortion, those problems need to be addressed in the mix session. The mastering workflow assumes the mix is fundamentally correct. A useful test: can you listen to the mix on consumer earbuds and enjoy it without wincing? If not, go back to the mix.

2. Over-limiting and destroying dynamics. Chasing extreme loudness is the single most common mastering mistake. The loudness wars are effectively over for streaming — normalization levels the playing field. A track mastered to -8 LUFS doesn't sound louder than a -14 LUFS track on Spotify; it sounds worse. The limiting required to reach -8 LUFS crushes transients, smears the stereo field, and introduces inter-modulation distortion. Target -14 LUFS and preserve your dynamics.

3. Not using reference tracks. Without comparison to commercially released music in your genre, tonal balance judgments are unreliable. Your listening room may have bass buildup at 80Hz that makes you roll off the low end; your headphones may have a treble peak that makes you dull the highs. References calibrate your decisions against what successful releases in your genre actually sound like. Import 2–3 reference tracks into every mastering session and A/B frequently.

4. Making critical decisions on headphones only. Headphones, particularly consumer headphones, have exaggerated bass response relative to flat studio monitors. Decisions made on headphones often produce masters that are bass-light on speakers. The inverse is also true — certain headphone models flatter the high end and cause over-rolled treble on speakers. Use at least two different playback systems (studio monitors plus headphones, or studio monitors plus a consumer Bluetooth speaker) and check mono compatibility on a phone speaker. Our article on mixing headphones vs studio monitors explores the specific tradeoffs in detail.

5. Adding too much of everything. Master processing should be subtle and cumulative. Each stage adds a small amount of change; the result is a polished, competitive master. If any single plugin in the mastering chain is making an obviously audible difference that you'd describe as “dramatic,” it's too much. The mix does the work; mastering does the polish. If the mastering is fixing problems, something is wrong with the mix.

6. Mastering in a poorly treated room. Acoustic treatment is the most impactful “plugin” in your mastering setup. A room with uncontrolled first reflections and bass buildup will cause you to make mastering decisions based on what your room sounds like, not what your master sounds like. Bass trapping and absorption panels in the first reflection points are minimum requirements for a functional mastering environment. See our complete guide to home studio acoustic treatment for specific recommendations.

7. Skipping the mono check. Always sum your master to mono and check that the low end doesn't collapse, the stereo enhancement doesn't create phase cancellation, and the mix remains intelligible. A surprising number of mixes that sound fine in stereo lose significant low-end or become confused in mono. This matters because phone speakers, club PA side fills, and radio all operate in mono.

How to Know When Your Master Is Finished

Knowing when to stop is the hardest mastering skill. The tendency — especially for producers mastering their own music — is to keep adjusting, keep tweaking, keep convincing yourself something isn't quite right. Here's a practical framework for deciding when the master is done.

The reference test: Play your master back-to-back with your reference tracks at matched loudness. Does your master sit comfortably in the same sonic space? Not identical — your production has its own identity — but in the same ballpark for tonal balance, loudness, stereo width, and low-end weight? If yes, you're close to done. If there's a specific, identifiable difference that bothers you, address only that one thing, then test again.

The fresh ears test: Save your session, close it, and come back after at least a few hours — ideally the next day. Play the master before you listen to anything else. If it sounds right in those first 30 seconds before your ears adapt, the master is likely solid. If something immediately jumps out as wrong, address it. The inability to hear your own work objectively after extended sessions is the single biggest argument for hiring a professional mastering engineer on important releases.

The multiple systems test: Check the master on at least four playback systems: (1) your studio monitors in the near-field position, (2) your mixing headphones, (3) consumer earbuds or a phone speaker, (4) a car audio system if accessible. If it translates reasonably well across all four — consistent tonal character, audible low end, clear vocals and leads — the master is working. No master sounds identical across all systems, but a good master doesn't dramatically change character between them.

The loudness meter confirmation: Confirm your integrated LUFS reading is within 0.5 LUFS of your target (-14 LUFS), your true peak ceiling is at or below -1dBTP, and your dynamic range (LU range or PLR) is appropriate for the genre. Electronic music and hip-hop typically land in the 6–10 LU range. Live-sounding acoustic and folk recordings might land at 12–18 LU. Check that your reading makes sense for what you've made.

The “is this mixing or mastering” test: If a problem you're hearing requires a fix that would only make sense at the mix stage — the vocal is too loud, a specific synth is too bright, a snare hit is too long — you're trying to master around a mixing problem. Stop, go back to the mix, fix the problem there, re-export, and master again. This loop is normal and expected. Many professional engineers cycle between mix and master two or three times before the master is truly finished.

Producers who want to build the ear training skills to make better mastering judgments faster will benefit from our dedicated ear training for music producers guide, which covers frequency recognition, dynamic range perception, and comparative listening exercises.

Final Delivery: File Specs and Distribution

Once the master is finished, export the final master file in the correct format for your distribution path.

For streaming distribution: Export a 24-bit, 44.1kHz WAV file. This is the standard delivery format accepted by all major distributors (DistroKid, TuneCore, CD Baby, Amuse, etc.). Do not deliver an MP3 to your distributor — distributors encode to the platform's required format from your WAV file, and starting from MP3 introduces generation loss.

For CD production: A 16-bit, 44.1kHz WAV with dithering applied (dithering is a final noise-shaping step that minimizes quantization distortion when reducing bit depth from 24-bit to 16-bit). Apply dithering only once, as the absolute last step, after all other processing is complete. MBIT+ (Waves), POW-r (used in many DAWs), and UV22HR (Waves, Sonnox) are common dithering algorithms. The choice is subtle — any of these dithering options produces correct results.

For vinyl: Vinyl mastering is a specialized discipline with specific considerations — low-end mono compatibility is critical (the stylus can't track stereo bass), high-frequency sibilance needs management, and total program length affects cutting level. If you're releasing on vinyl, engage a dedicated vinyl mastering engineer. DIY vinyl mastering is not recommended unless you have direct experience with the cutting process.

Naming convention: Name your master files clearly: ArtistName_TrackTitle_Master_24b_44.1k_FINAL.wav. Keep the unmastered mix file and your mastering session archived — if a distributor or sync client requests a different loudness delivery or a stems-for-remaster later, you'll need both.

Metadata: Embed basic metadata in your master WAV: track title, artist name, ISRC code (if registered), album title. Most DAWs support this via file export settings or BWF (Broadcast Wave Format) metadata. ISRC registration is free through your performing rights organization and essential for royalty tracking across streaming platforms. For more on the distribution side of releasing your master, our guide on how to distribute music covers every major distributor and their submission requirements.

Practical Exercises

Frequently Asked Questions