How do you master a finished mix so it is balanced, loud and consistent across systems?
The mastering stage: working from a pre-master, applying corrective and tonal EQ, dynamics and limiting, controlling loudness, sequencing and preparing the final deliverable.
An SQA Advanced Higher Music Technology answer on mastering, covering the pre-master to master process, mastering EQ and dynamics, loudness and the role of the limiter, dithering and final deliverables, and how mastering makes a mix balanced, loud and consistent across playback systems.
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What this skill is asking
The SQA wants you to master a finished mix: working from a pre-master, applying gentle EQ and dynamics across the whole track, controlling loudness with a limiter, and preparing the final deliverable at the correct format. Mastering is its own marked stage of the production project (worth 20 marks), so you must understand both the order of the process and the purpose of each step.
The pre-master and the goal of mastering
Mastering is the bridge between a finished mix and the released track. It begins with a clean pre-master: a stereo bounce of the completed mix left with headroom so there is room to process, and crucially without a limiter already crushing the mix bus. The mastering engineer's job is not to fix the mix but to polish the whole: to balance the overall tone, set a loudness that sits comfortably alongside other releases in the same style, and ensure the track sounds good everywhere, from studio monitors to earbuds to a phone speaker. It is always a holistic, whole-track process rather than work on individual instruments.
Mastering EQ and dynamics
The processing in mastering is subtle by design. EQ moves are small and broad, perhaps a gentle reduction where the low mids build up, a touch of air at the top, or a tightening of the very low end, all aimed at the overall balance and at how the track translates between systems. Dynamics at this stage usually means light compression to add cohesion and even out the energy, again across the whole mix. Because everything is being processed together, heavy-handed moves do more harm than good, so restraint and careful listening, ideally against references, are the marks of good mastering.
Loudness and limiting
Loudness is where mastering is most visible. A brick-wall (peak) limiter is placed last and allows the average level to be raised to a competitive loudness while its ceiling guarantees that no peak exceeds the output and clips. The temptation is to push as loud as possible, but over-limiting squashes the dynamics, makes a track fatiguing and can distort, so a skilled engineer targets an appropriate loudness for the style and the medium and preserves some dynamic life. Understanding the trade-off between loudness and dynamics, sometimes called the loudness war, is part of the Advanced Higher picture.
Preparing the deliverable
The last stage turns the processed audio into a finished file. The track is topped and tailed so it starts and ends cleanly, and if it is part of an album the tracks are sequenced and the gaps between them set so the record flows. When the bit depth is reduced for delivery (for example from 24-bit to 16-bit for CD), dither is applied: a tiny amount of noise that masks the distortion that would otherwise come from truncation, preserving low-level detail. Finally the master is exported at the correct sample rate and bit depth for its destination. These practical, format-aware steps are part of what the mastering marks reward.
Examples in context
A single pop track is mastered for streaming: gentle EQ to balance the tone, light compression for cohesion, and a limiter set to a sensible loudness with a safe ceiling. An album adds sequencing, consistent loudness and tone across tracks, and set gaps so the record plays as a whole. A film stem is mastered to the loudness standard required for broadcast or cinema. In every case the skill is the same: polish the whole, control loudness without crushing it, and deliver the correct file.
Try this
Q1. State what a pre-master should have before mastering begins. [1 mark]
- Cue. Headroom (peaks below 0 dBFS) and no limiter on the mix bus.
Q2. State what a brick-wall limiter does at the mastering stage. [1 mark]
- Cue. Raises loudness while a ceiling prevents peaks from clipping.
Q3. State why dither is applied when reducing bit depth. [1 mark]
- Cue. It masks the distortion from truncation, preserving low-level detail.
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SQA AH style6 marksDescribe the main stages of mastering a single track, from receiving the mix to producing the final file, and explain the purpose of each stage.Show worked answer →
Mastering starts from a pre-master: the finished stereo mix bounced with headroom (peaks not hitting 0 dBFS) and no limiter on the mix bus. The first stage is critical listening and reference, comparing the mix to commercial tracks in the same style to judge tone and loudness.
Next comes tonal and corrective EQ, gentle, broad moves across the whole mix to balance the frequency spectrum, for example easing a build-up in the low mids or adding a little air, so the track translates well on different systems.
Then dynamics: gentle compression to add cohesion and control, if needed, treating the mix as a whole rather than individual parts.
Then loudness and limiting: a limiter on the master raises the overall level to a competitive, consistent loudness while a ceiling stops the peaks clipping. The engineer targets an appropriate loudness for the medium rather than simply maximising it.
Finally, preparing the deliverable: setting the start and end, sequencing if it is part of an album, applying dither when reducing bit depth, and exporting the final file at the required sample rate and bit depth.
Markers reward the ordered stages (pre-master with headroom, reference listening, tonal/corrective EQ, gentle dynamics, loudness and limiting, deliverable with dither) each with a correct purpose.
SQA AH style4 marksExplain why a mix should be exported with headroom before mastering, and what a brick-wall limiter does at the mastering stage.Show worked answer →
A mix should be exported with headroom, peaks comfortably below 0 dBFS and with no limiter on the mix bus, so the mastering engineer has room to process the audio. EQ boosts and dynamics can raise the level, and if the mix already peaked at 0 dBFS there would be no space to work without immediate clipping.
A brick-wall limiter at the mastering stage raises the overall loudness while setting a ceiling (just below 0 dBFS) that the signal cannot exceed, so no peak clips the output. It allows the average level to come up to a competitive loudness without the peaks distorting.
Markers reward the reasons for headroom (room to process, avoiding clipping during mastering) and a correct description of the limiter raising loudness while a ceiling prevents peaks from clipping.
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