Hip-Hop & Trap Audio Mastering: How to Master

Hip-hop and trap audio mastering is mostly a low-end problem, and you can handle the final stage in the free Audio Master tool right in your browser. Keep the 808 and kick from fighting, stop the sub from eating all your headroom, bring the vocal forward around 2–5 kHz, and pick a loudness target that won't crush the drums. The tool is a plain DSP chain (EQ, multiband compression, stereo width and a limiter), and your audio never leaves your device.

One thing up front. A long, sustained 808 is the loudest thing in most trap records, even when it doesn't sound like it. It decides how hard the limiter works. So most of this guide is really about the bottom 100 Hz.

Why hip-hop audio mastering is different

Compared with EDM or rock, rap and trap put different demands on the master:

• The 808 is sustained, not percussive. A kick is over in a few hundred milliseconds. An 808 can ring for a full bar. That constant sub energy pushes the limiter the whole time, not just on the hits.
• The vocal is the lead instrument. In rock the guitars share the midrange with the voice. In rap the words carry the song, so presence and intelligibility matter more than width or sparkle.
• Punch sells the beat. Snares, claps and kicks need their front edge. Over-limit them and the beat goes flat, even while the meter says it got louder.
• Most listeners hear it on small speakers. Phones and earbuds barely reproduce 40 Hz. If the 808 has no upper harmonics, it disappears on them.

If you want the general order of processing first, read what the mastering chain is. The rest of this guide covers what changes for hip-hop.

Step 1: Fix the 808 and kick in the mix

Mastering can't separate two sounds that are glued together at 50 Hz. Sort this out before you bounce.

1. Decide who owns the lowest octave. In most trap the 808 carries the fundamental and the kick provides the click and punch above it. If both sit at the same note, one of them needs to move. Tune the 808 to the song's key, and use the Key Finder if you're not sure what key the beat is in.
2. Keep the sub in mono. Put a bass-mono or utility plugin on the 808 (or the mix bus) below roughly 100–120 Hz. Stereo sub can partly cancel on mono playback and it wastes limiter headroom. Mono vs stereo audio explains why. Audio Master's stereo width control is full-band, so it can't mono just the bass for you.
3. Check for 808 distortion before the master. Plenty of trap 808s are saturated on purpose. That's fine. What isn't fine is a mix bus that's already clipping. Bounce with peaks around -6 to -3 dBFS and no limiter on the master bus. What is audio clipping covers the difference.
4. Give the 808 some harmonics. A touch of saturation in the mix adds overtones around 100–200 Hz, which is what makes the 808 audible on a phone.

Want to know how clean your low end really is? Run the mix, or a reference track you admire, through the Stem Splitter and solo the bass and drums. It's AI separation, so it takes a while, but listening to the 808 on its own shows you quickly whether it's clean or muddy.

Step 2: Load the track and set the rumble filter

Open Audio Master and drop in your WAV. The tool analyzes the original loudness first, so you get a before-and-after LUFS readout.

The Rumble filter is a high-pass you can set from 20 to 100 Hz; it defaults to 30 Hz. For trap, leave it at 20–30 Hz. A lot of 808s are tuned to notes in the 30–50 Hz range, and a 40 Hz or 50 Hz setting would thin out the very note the beat is built on. Only move it up if the mix has sub-sonic junk below the 808 that you can see on an analyzer but can't hear.

Step 3: EQ for a tight low end and a clear vocal

The Equalizer has five bands, each adjustable by ±6 dB: a low shelf at 100 Hz, peaking bands at 250 Hz, 1 kHz and 4 kHz, and a high shelf at 8 kHz.

Hip-hop settings to try, as starting points only:

• Low 100 Hz: 0 to +1 dB, often less than you think. The shelf lifts everything below 100 Hz, 808 included. Every dB you add is more sustained energy for the limiter to push against. If the 808 already shakes the room, try a small cut instead.
• 250 Hz: -1 to -2 dB. 808 tails and kick boom stack up here. A small dip makes the low end sound tighter and gives the vocal more room.
• 1 kHz: usually leave it alone. Boost here and the vocal can start to sound nasal or honky.
• 4 kHz: +1 to +2 dB. This band is centered in the 2–5 kHz presence region where consonants and vocal clarity live. A small lift pushes the rapper forward without turning the beat up.
• 8 kHz: 0 to +1 dB. Hi-hats and air. Go easy, because trap hats and sibilance get harsh quickly once the limiter is working.

The Genre preset menu offers Flat, Warm, Bright, Punchy and Vocal-Forward. For a vocal-led rap record, Vocal-Forward is the natural start: it trims the low shelf and 250 Hz, lifts 1 kHz and 4 kHz, and narrows the width slightly to 90%. For a beat-driven trap banger, Punchy is closer: it lifts the low shelf 2 dB, dips 250 Hz and adds 4 kHz presence. Both presets set compression to Firm. Pick one, then adjust from there.

This is where hip-hop settings diverge from the EDM ones. In EDM audio mastering the low shelf lift and the sidechain pump are the story. In rap, the vocal gets the presence boost and the sub gets restraint.

Step 4: Compression for punch, not just loudness

The Compression control has four steps: Off, Gentle, Firm and Aggressive. It's multiband, meaning the signal is split into three bands (below about 200 Hz, 200 Hz to 4 kHz, and above 4 kHz) and each one is compressed on its own. For hip-hop that's useful: a long 808 note gets controlled in the low band without pulling the vocal and hats down with it. What is multiband compression explains the idea.

A sensible way in:

1. Start at Gentle, even if the preset put you on Firm.
2. Loop a section with the vocal, the 808 and the drums all playing. Switch the A/B button between Hearing: Mastered and Hearing: Original. Both sides play at the same loudness, so you're judging the processing and not the level jump.
3. Step up to Firm if the 808 swells and dips from note to note, or the vocal jumps out and falls back.
4. Back off if the snare loses its crack or the kick stops punching through.

Aggressive can work on dense, loud trap. Treat it as a deliberate choice, and check the drums every time you use it. What is a transient covers what you're trying to keep.

Step 5: Keep the width sensible

Stereo width runs from 0% (mono) up to 160%, with 100% leaving the image unchanged. Because it's full-band, widening the mix also widens the 808. For hip-hop, stay between about 90% and 105%. The vocal, kick, snare and 808 all live in the center, and that center is what holds the record together on a phone speaker.

Step 6: Choose a loudness target

The Loudness target menu has Spotify (-14 LUFS), YouTube (-14 LUFS), Apple Music (-16 LUFS) and Club / Loud (-9 LUFS). The tool adjusts gain into a limiter with a ceiling around -1 dB, so picking a target drives that limiter the way a mastering chain normally would. LUFS measures perceived loudness; what is LUFS covers the details.

Here's the trade-off for hip-hop:

Target	Good for	What it costs
Spotify / YouTube (-14 LUFS)	Streaming releases, most uploads	Sounds quieter next to loud masters when played unnormalized
Club / Loud (-9 LUFS)	DJ sets, promo, mixtape links, car tests	Punch and 808 clarity; streaming turns it down anyway

Spotify normalizes playback to about -14 LUFS integrated by default, and its guidance is to keep true peaks below about -1 dBTP (around -2 dBTP for masters louder than -14 LUFS), since lossy encoding can push peaks higher. A -8 LUFS master gets turned down by roughly 6 dB on Spotify, and what remains is the flattened drums. Other services use different reference levels, so check how streaming loudness normalization works or the platform guide in how to master for Spotify before you decide.

Loud masters are common in rap and trap. You don't have to match them. A -14 master with a punchy kick often sounds better on Spotify than a -7 master that got turned down. If you need both, make two exports: one at Spotify for release and one at Club / Loud for DJs. The tool doesn't save settings between sessions, so write down your EQ and compression before the second pass.

Still torn on the number? What LUFS should I master to goes deeper.

Step 7: Listen for 808 damage, then export

The 808 is the first thing a hard-working limiter breaks. Loop the loudest section and listen for:

• Crackle or fuzz on long 808 notes. The limiter is pumping against the sustained sub. Pull the low shelf down or pick a quieter target.
• The vocal ducking when the 808 hits. The whole mix is being turned down on each bass note. Same fix: less low end going in.
• A dull, flat snare. Too much compression or limiting. Drop the compression a step.

If you hear any of these, why your master sounds distorted walks through the causes. Also be aware that the limiter is built from a standard browser compressor, not a true-peak limiter. For a release, leave a little margin and check the file in a true-peak meter if you have one. What is true peak explains why that matters.

When it sounds right, pick a format in the export selector and click Export mastered. Use WAV for distributors. MP3 works for a quick share, and Opus shows up in browsers that support it. If the export seems quieter than you expected, read why your master is too quiet.

Hip-hop mastering checklist

• 808 and kick don't share the same fundamental
• Sub is mono below roughly 100–120 Hz, done in the mix
• Mix bounced with no master-bus limiter and a few dB of headroom
• Rumble filter at 20–30 Hz
• Low shelf lifted no more than about +1 dB, or cut if the 808 is heavy
• 250 Hz dipped slightly; 4 kHz lifted slightly for the vocal
• Compression at Gentle or Firm, checked with the level-matched A/B
• Width between about 90% and 105%
• Loudness target chosen for where the track will actually play
• Long 808 notes checked for limiter crackle before export

Troubleshooting

The 808 vanishes on phone speakers. Phones can't reproduce the fundamental. Add harmonics to the 808 in the mix with saturation, then check again. A bigger low shelf in the master won't help here.

The master sounds loud but small. The limiter is flattening the drums. Try Spotify instead of Club / Loud, or drop compression to Gentle.

The vocal gets buried when the beat drops. Try Vocal-Forward, lift 4 kHz a little more and trim the low shelf. If that's not enough, the vocal needs to come up in the mix.

Everything sounds muddy. Dip 250 Hz a bit more, and read why your mix sounds muddy. Mud usually has to be fixed in the mix.

Related tools

• Volume Normalizer: match a track to a LUFS level without EQ or compression, handy for DJ edits and snippets.
• Stem Splitter: pull apart a reference track to hear how its 808 and vocal sit.
• Key Finder: find the key so you can tune the 808 to the song.

Compare your master with a released record in the same lane, too. Mastering with a reference track shows how to do it at matched loudness. Free audio mastering in the browser covers the essentials. It doesn't give you bass-mono crossovers, adjustable band splits or a true-peak ceiling you set yourself, and for those you'd need dedicated audio mastering software. For the wider picture, see free vs paid audio mastering or the general walkthrough, how to master a song online for free.

Frequently asked questions

How loud should a hip-hop master be?

For streaming, around -14 LUFS integrated is a safe target, because Spotify normalizes to that level by default and YouTube is widely measured at about the same. Many commercial rap and trap records are mastered much louder, and a louder version can make sense for DJs or promo. Just know that extra loudness usually costs some punch and 808 clarity once streaming turns it back down.

Why does my 808 distort after mastering?

A sustained 808 keeps pushing the limiter for the whole note, so any extra low end turns into crackle or fuzz. Lower the 100 Hz shelf, choose a quieter loudness target, or use less compression. Also check that the mix itself isn't clipping before you master, since mastering can't remove distortion that's already in the file.

Should the 808 be mono?

Yes, in most cases. Keeping the sub below roughly 100–120 Hz in mono stops it from partly cancelling on mono speakers and makes limiter behavior more predictable. Do this in the mix with a bass-mono or utility plugin. Audio Master's stereo width control affects the full frequency range, so it can't mono just the bass.

Which preset should I use for rap vocals?

Start with Vocal-Forward for a vocal-led track. It trims the low end slightly, lifts 1 kHz and 4 kHz for presence, and narrows the stereo width a little. For a beat-driven trap track, Punchy is closer. Either way, treat the preset as a starting point and adjust the EQ by ear with the level-matched A/B.

Is free online audio mastering good enough for a hip-hop release?

It can be, if the mix is already solid. A browser tool covers EQ, multiband compression, width and limiting to a LUFS target, and your audio never leaves your device. It won't fix a kick and 808 clash or a muddy mix, and it lacks advanced controls like bass-mono crossovers, so fix the mix first.