How to Prepare Your Mix for Mastering
Updated July 2026 · by Loopin
Mastering can only polish what you give it. A few minutes of mix prep — the right headroom, a clean master bus, a tidy export — makes the difference between a master that opens up and one that fights a squashed file.
Leave headroom on the master bus
The most important step is to give the mastering stage room to work. Aim for your mix to peak around −6 to −3 dB with no clipping, leaving a few dB of headroom. That space lets a master add loudness and glue without running into the ceiling and distorting. A mix already slammed to 0 dB has nowhere to go.
If your overall level is too hot, don’t reach for limiting — just pull down the master fader (or a gain plugin on the bus) until the peaks sit in that range. You’re lowering the whole mix evenly, which preserves the balance you worked on while creating the room the master needs.
Take the limiter off the master bus
If you have a limiter or heavy clipper on the master bus ‘to make it loud’, bypass it before you export. That processing pre-squashes your dynamics and ties the mastering stage’s hands — it can’t recover transients you’ve already crushed. Mastering is where loudness is dialled in; let it do that job on an open mix. See the difference in mixing vs mastering terms.
Gentle bus processing you used as part of the sound — a touch of bus compression for glue, an EQ move that’s integral to the vibe — can stay, because it’s part of the mix. The rule of thumb: keep what shapes the song, remove what only chases volume.
Fix obvious problems first
A master accentuates whatever’s already there, so clean the mix before you hand it over. Tame a boomy or lopsided low end — muddy bass and an over-loud kick get worse, not better, once a master adds level. Check the mix in mono so nothing important disappears, and listen for harsh sibilance or a resonant frequency that’ll only get more pronounced.
Also confirm your fades and tails are clean: no clicks at the start, no abrupt cut at the end, no stray noise in the silence. These are trivial to fix in the mix and annoying to fix afterward. A tidy, balanced mix is the single biggest factor in how good the master sounds.
Export the right file
Bounce a WAV (or AIFF) at the mix’s native sample rate and bit depth — ideally 24-bit. Don’t export an MP3 to master; lossy compression bakes in artefacts a master will only amplify. Disable any final dithering and don’t normalise on export — you want the true peaks and the headroom you set, untouched.
Render the full song including a moment of silence at the head and tail so fades and reverb tails are complete. Name it clearly, and you’re ready — one clean, full-resolution file is exactly what a master needs.
Then master it
With a prepped file, mastering is quick. Drop your bounce into Loopin’s free online mastering and it measures the track, targets streaming loudness around −14 LUFS and holds true peak at −1 dBTP, then lets you A/B against the original at matched loudness so you judge tone honestly.
If something sounds off after mastering — bass too heavy, top end harsh — that’s usually a sign to revisit the mix, not the master. Good prep means fewer of those moments. Fix it in the mix, re-export, and master again.
Frequently asked questions
How much headroom should I leave for mastering?
Aim for your mix to peak around -6 to -3 dB with no clipping. That leaves room for the mastering stage to add loudness and glue without distorting. If your mix is too hot, lower the whole master fader rather than adding a limiter.
Should I remove the limiter before mastering?
Yes. A limiter or heavy clipper used for loudness on the master bus pre-squashes your dynamics and limits what mastering can do. Bypass it before exporting. Gentle bus compression or EQ that's part of the sound can stay.
What file should I export for mastering?
Export a WAV or AIFF at the mix's native sample rate, ideally 24-bit, with no dithering and no normalisation. Don't master an MP3 — lossy artefacts get amplified. Include a little silence at the head and tail so fades and tails are complete.