Definition
Mastering is the last creative stage and the first technical stage of distribution: it takes the finished stereo mix (or a few stems) and prepares it to be heard everywhere and released. It is not “making the track louder”: it is making it translate across all systems, making it consistent with the other tracks on the record and with the genre, and delivering it in the correct formats. The “Mastering Chain and Translation” lesson describes the chain; here we clarify the goals.
The goals
- Translation: the track must sound good on headphones, in the car, on a phone, in the club, on Bluetooth speakers. Mastering corrects small tonal imbalances the mix carries with it (often due to the room it was mixed in).
- Tonal balance: broad and small corrections (±0.5–2 dB) of lows, mids, highs, relative to genre references.
- Dynamics and loudness: a level that is competitive but appropriate to the genre and the medium, without destroying transients; peak control (true peak).
- Album/EP consistency: perceived levels and tone that are uniform across tracks, plus sequencing, gaps between tracks, fades, transitions.
- Quality control (QC): removing clicks, noises, distortion, phase problems, badly cut starts and ends; checking that there are no export errors (missing samples, silence codes).
- Delivery: files in the required formats (WAV for streaming, DDP for CD, vinyl master, instrumental, clean, TV mix versions), metadata (ISRC, UPC/EAN, CD-Text), documentation.
- A second pair of ears: a mastering engineer listens to the track in a calibrated room, without the emotional involvement of whoever produced it.
What mastering is NOT
- It doesn't fix a bad mix: a vocal that is too low, muddy lows, or a missing snare get fixed in the mix (or partly with stem mastering).
- It isn't a preset: every track calls for different choices.
- It isn't the loudness race: with platform normalization a master that is too compressed gets turned down and just sounds flatter.
What the mastering engineer asks of the mix
- Final mix as 24-bit or 32-bit float WAV, at the project sample rate.
- No limiter on the mix master (or a version with and one without, if the limiter is part of the sound).
- Peaks around −6/−3 dBFS, no clipping.
- A few seconds of margin at the start and end, complete reverb tails.
- Notes: references, targets, requested versions, track order, any difficulties.
Mastering on your own (for a producer)
Many producers master their own singles. Rules: wait at least a day after the mix, listen to references at equal loudness, make small moves, check on several systems, verify loudness and true peak. If the mastering requires big moves, go back to the mix. Useful tools: iZotope Ozone, FabFilter Pro-Q / Pro-C / Pro-L, in FL Studio Fruity Limiter, Maximus (multiband), Parametric EQ 2, Soundgoodizer (a simplified Maximus); loudness meters (Youlean Loudness Meter, free).
Example
4-track EP in A minor and C major, mixed on different days: track 2 has more low end than 3, track 4 is brighter. Mastering: broad EQs to realign them to the references, integrated loudness between −10 and −9 LUFS for all, with the ballad at −11 (it should sound gentler but not much quieter), 2 s gaps, final fade on track 4 refined. Delivery: 24-bit/44.1 kHz WAV with ISRC, instrumentals.
Exercise
Take three of your own mixes from different periods and master them as if they were an EP: the goal is for them to sound like a family. Note how much you have to correct each track: it tells you what to improve in your mixes.
Links
“Mastering Chain and Translation”, “Loudness, LUFS, and Normalization”, “Formats and Delivery”, “Review and A/B Comparison at Equal Loudness”, “Stem Mastering”.