The top of your mix is drums
Put a peak meter on almost any dense mix and the tallest events are the kick and the snare. The vocal, the guitars and the synths live several decibels below them, because sustained sound reads loud without ever reaching the peak.
This is the whole argument. The headroom you are trying to buy is being held by two or three drum hits per bar. Everything else in the mix is already out of the way.
Why the same 3 dB costs less on the drum bus
Clip 3 dB on the master and HardStop takes a corner out of whatever happens to be playing when the drum hits, which is the vocal, the bass and the guitars, all at once. The drum hit is what pushed the signal up there, but the distortion is spread across the sustained material sitting underneath it. Sustained, tonal sound is exactly where clipping distortion is most audible, which is the point of what clips well and what does not.
Clip the same 3 dB on the drum bus and only the drums are touched. Transients mask their own distortion: the corner happens during a 20 millisecond attack, with nothing tonal held across it. You get the same 3 dB of peak reduction at the master output, and it is far harder to hear.
Same headroom, cheaper.
Split the work
The usual mistake is picking one place. Two stages, each doing less, beats one stage doing all of it.
A starting point for a dense mix:
| Stage | Clipping | What it is doing |
|---|---|---|
| Drum bus | 2 to 4 dB | Taking the kick and snare tips down to the level of the rest of the mix |
| Master | 1 to 2 dB | Catching whatever is still sticking out once the drums are no longer the tallest thing |
Once the drum peaks are level with the rest of the mix, the master clipper has almost nothing left to grab, which is the point. If you find it still needs 4 dB, the drum bus stage was not doing its job.
On the drum bus, use HQ rather than Normal. Normal applies no anti-aliasing by design, and a drum bus is full of cymbals, the brightest and most aliasing-prone material there is. The quality tiers are explained in what the quality modes cost.
The procedure
- Drum bus first, master clipper bypassed. Set your zero by dragging the Ceiling onto the peak tips as in why it clips everything, then add Drive until the kick stops growing and starts flattening. AUTO GAIN on.
- Check the delta on the drum bus alone. You should hear attack transients and nothing else. Cymbal fizz means back off or move up a quality tier.
- Now unbypass the master and look at the waveform. The peaks should already be much more even than they were.
- Add 1 to 2 dB there, no more. If the mix gets louder without getting smaller, you are in the right place.
- TP SAFETY on the master only. You do not need true-peak protection on an internal bus, and it costs latency.
What not to do
Do not clip every channel a little. Eight channels at 1 dB is not 8 dB of headroom. It is eight sets of corners on eight sources, and the distortion adds up long before the headroom does. Clip where the peaks actually are.
Do not clip the bass to buy headroom. The kick and the bass are competing for the same low end, and clipping sustained low notes goes buzzy fast. Take the peak off the kick on the drum bus and let the bass keep its shape.
Do not clip a bus you are still mixing into. Every fader move upstream changes how much clipping you are doing. Get the balance first, then clip.
When splitting is not the answer
If the mix needs more than about 6 dB total across both stages to reach the loudness you want, the problem is not where you clip. It is the arrangement or the balance. That is the point to hand the last stretch to a limiter after HardStop, or to go back to the mix, as in using a reference to decide how much is enough.
For where this sits in a pre-release pass, see the mixing checklist pros use before every release.