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Technical Guide: Why Turning Things Down Is Not The Same As Leaving Headroom
Turning the master fader down isn’t quite the same as leaving headroom. The clue is in the word. Headroom is something you leave as you go, not something you add at the end.
Pull the fader down at the last minute and you’ll get a quieter file, and depending on what’s in your session that file might be perfectly clean. What hasn’t changed is everything above that fader: the balance, the processing, and the relationship between your peaks and everything sitting underneath them. That last one is what we actually work with.
None of which means a track that needed the fader pulled down can’t be mastered. Usually it can. Some headroom is always better than none, and if you’re not sure where yours sits, send it over. We’ll have a listen and give you an honest answer on whether a master will do what you’re hoping it’ll do.
The one worth avoiding
There aren’t many hard rules in music production, but here’s one worth keeping: don’t mix into a limiter that’s pushing 0 dBFS on your master, then turn the fader down afterwards.
That’s where the real problems live. The limiter did its work at that level. It pulled your peaks down into the body of the track long before the fader saw anything, and turning it down afterwards moves the whole lot quieter without giving any of that back. We open the file, see a tidy −6 dBFS peak, and find there’s almost nothing underneath it to work with.
Same goes for heavy compression or saturation on the master channel. It’s not that those things are wrong. Plenty of great records were mixed that way. The problem is that they’ve already made their decisions by the time the fader gets involved, and we can’t unmake them.
What headroom actually buys you
The useful number here is crest factor, the gap between your peak level and your average level. A kick with a sharp transient has a big gap. A track that’s been limited hard has almost none, because limiting works by pulling the peaks down towards the average.
Here’s the thing the fader can’t touch: turning your mix down doesn’t change the crest factor at all. Peaks and average move together, so the gap stays exactly as it was. If your transients were already sitting on top of a wall of sound at 0 dBFS, they’re still sitting on top of it at −6.
When that gap is healthy, a mastering limiter has somewhere to work from. It can add weight and loudness without flattening anything, and the track keeps its punch. When the gap has already gone, the limiter has to work far harder for much less, and that’s where you get the smearing, the pumping, and the strangely lifeless loud master.
Where damage does actually get printed
Worth being straight about this, because it’s widely misunderstood. Modern DAWs, Ableton included, mix internally at 32-bit floating point. That means the internal signal path doesn’t clip at 0 dBFS. Signals can go over and come back down again intact. So if your mix simply ran hot and there was nothing on the master bus, pulling the fader down genuinely does give you a clean file.
Three places that stops being true:
- Anything with a modelled ceiling. Tape, console, transformer and valve emulations are built to distort when you drive them. Feed one a hot signal and it does exactly what it’s designed to do, and that’s printed into the audio from that point on.
- Any bounce to a fixed-point file mid-session. Bounce In Place, a frozen track, a 24-bit stem export: that’s where a real hard ceiling exists. It’s the most common way people clip something without ever seeing it happen.
- Your interface’s D/A converter. Above 0 dBFS at the converter clips in hardware, every time. Which is why a session that’s technically fine can still sound harsh and brittle while you’re working on it.
And the peaks you can’t see
One more reason not to run the whole thing right up to the ceiling. Your DAW’s peak meter measures individual samples, but when audio is converted back to analogue, or squeezed into an MP3 or AAC, the waveform gets reconstructed between those samples, and it can end up slightly higher than any single sample suggested. These are inter-sample peaks.
On a mix with real dynamics it’s usually a few tenths of a decibel. On something dense and heavily limited it can be a decibel or more. Not dramatic on its own, but it’s the difference between a master that plays back cleanly on a phone and one that gets a faint crackle on the loud bits. Leave some room and the problem never arises.
So how do you actually leave it?
If you’re starting a track from scratch, gain stage as you go. It takes no time and it saves a great deal of it later. Rough starting points:
- Kick around −12 dBFS peak
- Bass 2–4 dB under the kick
- Synths and pads around −14 dBFS
Those are starting points, not laws. A sustained bass reads very differently on a peak meter than a short kick transient, so use your ears over the numbers. But build from somewhere sensible and you’ll find you rarely have to fix anything at the end.
Already mixed it and happy with the balance? You don’t need to start again. Select every track in the session and pull them all down together until your master is peaking around −6 dBFS. The relationships between everything stay intact. One thing to listen for: if you’ve got compression or saturation on your buses or master, they’ll respond differently at the lower level, so give it a proper listen afterwards rather than assuming it’s identical.
If you’d rather be shown this than read about it, it’s the sort of thing that takes about ten minutes with someone looking at your actual session. We do 1-to-1 sessions over Zoom in Ableton, and most people find gain staging is the bit that changes how everything else sounds.
And if you’d genuinely rather not think about any of it, that’s fair enough. Send us the stems or the project file and we’ll handle the mix as well as the master.
In short...
Leave the room as you go rather than trying to make space at the end. Keep the master bus clear while you’re mixing. Aim for around −6 dBFS on your premaster, and don’t worry about hitting it exactly.
Hope that’s useful. If you’ve got it sorted, send your premaster over and we’ll get it sounding right.
Not sure where yours sits? Get this right at source and the master has something to work with. Send it over: one track mastered free, full length, no card needed.
