AI Mastering for Metal: Targets, Tone and Trade-offs

Most explanations of this start with a definition and stop before they get to the part that affects your session.

The target for Metal sits around -8 to -10 LUFS integrated, but the number is the least interesting part. What decides whether the master works is how the low end is handled, how much transient range survives the limiter, and whether the balance holds up on the systems your listeners actually use.

Nothing below is theory for its own sake. Every number here is one you can check on a meter, and every step is one you can run on the next track you open.

Key takeaways

Metal masters typically sit at -8 to -10 LUFS integrated.
Keep everything below 100 to 120 Hz mono for translation.
Send an unlimited mix with 3 to 6 dB of headroom.
Tonal balance beats loudness on every platform that normalises.

What a Metal master needs to do

Commercial Metal releases typically land around -8 to -10 LUFS integrated, with a -1 dBTP ceiling. That is a range rather than a rule: the right number for your track depends on how much dynamic movement the arrangement already has.

Three jobs, in order. Make the tonal balance translate on earbuds, phone speakers and a big system. Control the dynamics so the track holds attention without fatiguing. Hit the delivery specs so nothing gets mangled on the way to the listener.

Parameter	Typical for Metal	Notes
Integrated loudness	-8 to -10 LUFS	After normalisation, this mostly determines how compressed you had to be
True peak	-1 dBTP	Non-negotiable if you want a clean AAC encode
Low-end crossover	100 to 120 Hz	Below this, keep it mono for translation and vinyl safety
Stereo width	Wide above 300 Hz	Width in the sub is the single most common cause of a weak master

Typical integrated loudness by genre.

Where Metal masters usually go wrong

Sending a mix that is already limited. If the peaks are gone before mastering starts, nobody can put them back.
Stereo-widening the bass. It sounds bigger in headphones and disappears on a club system or a phone.
Chasing a loudness number instead of a tonal balance. Normalisation makes that trade a pure loss.
Mixing into a limiter and never bypassing it. You stop hearing what the mix actually does.
Ignoring how Metal is consumed. If most of your listeners are on earbuds, that is the reference system that matters.

How the engine handles style

MaestroNet does not apply one curve to everything. It analyses the source first: spectral balance, crest factor, stereo correlation, transient density, and where the energy actually sits.

Style selection then sets the targets rather than the processing. The chain is the same. What changes is the loudness target, the tonal reference curve, how much low end is protected, and how aggressively the limiter is allowed to work.

That distinction matters. A style preset that swaps in different EQ curves regardless of the source will fight a mix that is already correct.

Prepare the mix before you master it

Bounce at 24-bit, at the session sample rate. Never bounce to MP3 and master that.
Leave 3 to 6 dB of headroom. Peaks around -6 dBFS is a good working target.
Take the limiter off the mix bus. Leave gentle bus compression if it is part of the sound.
Check the mix in mono. If the low end vanishes, fix it now rather than in mastering.
Fix problems at the source. Mastering cannot un-mix a vocal that is buried.

How it translates on real systems

Almost nobody hears your record on the system you made it on. The point of every decision above is that it survives the journey.

System	What it exposes	What to check
Phone speaker	No low end at all below roughly 500 Hz	Does the bass line still read from its harmonics?
Earbuds	Exaggerated width and sub, hyped top	Is anything sibilant or fatiguing?
Laptop	Thin midrange-only playback	Is the vocal still intelligible?
Car	Boomy low end and road noise	Does the low end turn to mush at 80 to 120 Hz?
Club system	Everything below 40 Hz, loud	Is the sub mono and controlled?

If it works on a phone and in a car, it works almost everywhere else. Those two are the honest tests.

Knowing when to stop

There is a point in every session where further work stops improving the record and starts merely changing it. Recognising that point is most of the skill.

You are undoing changes as often as you are making them.
You cannot articulate what the last move fixed.
The reference no longer sounds obviously better in any specific way.
You are adjusting things you would not notice as a listener.

Bounce it, sleep on it, and listen once in the morning on a system you did not use to make it. That single listen tells you more than another two hours ever will.

What MaestroNet does with this

MaestroNet analyses the source before it processes anything: spectral balance against a genre reference curve, crest factor, stereo correlation across frequency, transient density, and where the energy actually sits.

The targets move with the style. The chain does not. That matters, because a system that swaps in a different EQ curve regardless of what you sent will fight a mix that was already correct.

Loudness targeting to the platform standard, measured integrated across the whole track.
True peak limiting with oversampling, so the AAC encode stays clean.
Bass management below the crossover, keeping the low end mono and centred.
Tonal correction referenced to the selected style, applied in broad strokes rather than narrow ones.

What it will not do is decide that the second chorus should feel bigger than the first. That is an interpretive call, and it stays yours.

Frequently asked questions

What loudness should a Metal master hit?

Around -8 to -10 LUFS integrated for streaming, with a -1 dBTP ceiling. Treat it as a range that depends on how dynamic the arrangement already is.

Can AI mastering handle Metal properly?

Yes, for the technical layer: loudness targeting, true peak control and tonal balance. What it will not do is make interpretive calls about how a specific section should feel.

How much headroom should I leave in the mix?

Three to six decibels, with no limiter on the mix bus. Gentle bus compression is fine if it is part of the sound.

Why does my low end disappear on phone speakers?

Because there is nothing down there for a small driver to reproduce, and often because the bass is too wide. Keep everything under 100 to 120 Hz mono and make sure the harmonics above it carry the note.