Mixing: Decisions You Can Hear
A mix is not finished when there is nothing left to add. It is finished when there is nothing left to take away. Great mixing is 80% balance and volume leveling, 15% frequency carving, and only 5% dynamic enhancement.
1. The Static Fader Mix: The Crucial First Hour
Before applying a single EQ or compressor plugin, spend one uninterrupted hour establishing a static balance using faders and pan pots alone. Listen at conversation volume (around 70 to 75 dB SPL). If your arrangement does not sound cohesive and emotionally engaging with clean fader levels, slapping compressors on the master bus will only magnify the chaos.
The Low-Volume Monophonic Test
Switch your master output to mono and drop your monitoring volume until the loudest element in the mix is barely a whisper. Which instrument disappears first? If the vocal vanishes while the snare drum still cuts through, your vocal is under-leveled. Mixing in mono reveals frequency masking faster than any visual analyzer.
2. Carving Frequency Windows (Subtractive EQ)
Instruments fight when they compete for the same narrow band of energy. Instead of boosting highs on five different tracks to make them "cut through," cut the offending frequencies from competing channels.
| Frequency Zone | Musical Character | Common Culprits | Diagnostic Action |
|---|---|---|---|
| 20 – 50 Hz | Sub-bass rumble | HVAC, foot stomps, room resonance | High-pass filter all non-bass tracks (vocals, guitars, synths). |
| 200 – 400 Hz | Mud and boxiness | Acoustic guitar bodies, snare ringing, vocals | Dip by 2 to 3 dB with moderate Q to clear room for the bass line. |
| 1 – 2.5 kHz | Nasal presence & bite | Electric guitar crunch, vocal transients | Carve a small dip in guitars where the lead vocal formants sit. |
| 6 – 9 kHz | Sibilance & harshness | Vocal 'S' sounds, ride cymbals, distorted guitars | Use dynamic EQ or split-band de-essers rather than static shelf cuts. |
3. Serial Dynamic Compression
Asking one compressor to handle 10 dB of dynamic reduction sounds choked, introduces unnatural pumping, and flattens drum snap. Instead, distribute the workload across two complementary compressors in series:
Set a lightning-fast attack (sub-millisecond) and fast release with a 4:1 ratio. Aim for only 2 dB to 3 dB of gain reduction on the sharpest peaks. This catches rapid explosive consonants without squashing the body of the vocal.
Follow the peak limiter with a slower optical compressor. Its gentle program-dependent release provides transparent, musical leveling, catching another 2 dB to 3 dB. Together, the vocal sits solid and upfront without audible pumping artifacts.
4. Preparing for Mastering
When you finish your mix, avoid clipping the master fader to achieve commercial loudness. Leave that to dedicated mastering limiters. Deliver a clean 24-bit or 32-bit float WAV file with peaks reaching -3 dBFS to -6 dBFS, zero clipping, and no brickwall limiters on the master bus.