Learn to Master Audio

1. What Is Audio Mastering?

Mastering is the final step before your audio goes to listeners. It's the process of taking a finished mix and optimizing it for playback: making it loud enough, tonally balanced, and consistent across all devices and platforms.

Think of it as the polish on a finished product. Mixing is assembling the pieces; mastering is making the whole thing shine.

2. Understanding LUFS & Loudness

LUFS (Loudness Units Full Scale) is the industry-standard measurement of perceived loudness. Unlike peak meters that show instantaneous volume, LUFS measures how loud something sounds to human ears over time.

Platform Targets

3. Equalization (EQ)

EQ adjusts the balance between low, mid, and high frequencies. In mastering, EQ changes are subtle: we're talking 1-3 dB adjustments, not dramatic reshaping.

Key Frequency Ranges

High-Pass Filter (HPF)

The high-pass filter removes frequencies below a set point. This is essential for cleaning up rumble and low-end noise. For podcasts and voice, set it at 80-100 Hz. For music, 30-60 Hz depending on genre.

4. Compression & Dynamics

Compression reduces the difference between the loudest and quietest parts of your audio. In mastering, gentle compression evens out the overall dynamics without killing the life of the music.

Key Parameters

Threshold: The level above which compression starts. Set it so 3-6 dB of gain reduction occurs on the loudest parts.

Ratio: How much compression is applied. 2:1 is gentle (good for podcasts, acoustic music), 4:1 is moderate (most music), 8:1+ is heavy (aggressive music, social media).

Output Gain (Makeup): After compression reduces volume, output gain brings it back up to match the original level.

Multi-Band Compression

MasterForge Starter uses multi-band compression: separate compressors for low, mid, and high frequencies. This lets you tighten the bass without squashing the vocals, or control sibilance without affecting the low end.

5. Limiting & Loudness Ceiling

The limiter is the last link in the mastering chain. It prevents your audio from exceeding a set ceiling (usually -0.3 dBFS) while allowing you to push overall loudness higher.

Release: How quickly the limiter recovers. Fast release (30-50ms) sounds punchy but can distort. Slow release (60-100ms) sounds smoother and more natural.

6. Stereo Width & Mid-Side

Stereo width controls how wide or narrow the stereo image sounds. 100% is normal stereo, below narrows toward mono, above widens.

Mid-Side processing lets you treat the center (mid) and sides independently. Boost the mid channel for vocal focus, boost sides for spaciousness. This is a powerful tool for making podcasts sound intimate (narrow mid) or music sound expansive (wide sides).

7. Tips by Content Type

Music

Start with the Balanced preset and adjust from there. Use the High-Pass filter at 30-40 Hz unless you want heavy sub-bass. Target -14 LUFS for streaming. Don't over-compress: dynamics are what make music feel alive.

Podcast

Voice clarity is everything. High-pass at 80-100 Hz to remove room rumble. Moderate compression (ratio 3-4:1) keeps levels even between speakers. Target -16 to -18 LUFS. Keep stereo width narrow (50-80%), mono-compatible audio sounds better on phone speakers.

Voice / Voiceover

Similar to podcast but with more presence boost (2-4 kHz) for commercial impact. Higher compression ratio (4:1) for consistent levels. The Voiceover preset is tuned for broadcast-standard clarity. Target -14 LUFS for commercials, -18 LUFS for audiobooks.

Video Audio

YouTube normalizes to -14 LUFS, so that's your target. For social media (TikTok, Reels), you can push louder (-11 to -12 LUFS) since competitive loudness helps. For film/documentary, preserve dynamics with -18 to -20 LUFS: let the quiet parts be quiet.

8. Mastering Workflow in MasterForge Starter

Step 1: Drop your file. WAV, MP3, FLAC or OGG. Starter measures it in the browser before anything else happens: loudness, true peak, crest, spectral balance, stereo correlation and the artifact scores that neural audio tends to carry. Your audio never leaves your device.

Step 2: Pick a way in. Auto derives the whole chain from the measurement and renders in one click. Manual lets you choose the content type, the preset and the platform yourself. Fine-tune opens the EQ and dynamics so you can edit what Auto chose, by mouse or by keyboard.

Step 3: Content type. Music, Podcast, Voice or Video. It is a shortcut that sets a sensible preset and platform for that kind of material; you can still change either.

Step 4: Preset. Six characters: Balanced, Clear & Defined, Warm & Rich, Bright & Airy, Podcast and Voice, plus Raw (platform loudness only) and Custom. A preset is a direction, not a fixed curve: the chain is still derived from what Starter heard in your track.

Step 5: Platform. Streaming (Spotify, Tidal), Apple Music, YouTube, Podcast, Club or Reference. Each sets the loudness target and the true-peak ceiling the master is rendered to.

Step 6: Listen and export. A/B the master against your original at matched loudness, then download the WAV (16- or 24-bit) and the mastering report that says what was measured and what was done.