Part 1 of the Mixing Drums series. Future parts will cover electronic drums for synth- and sample-based music.
Drum Setup and Mic Placement Basics
Recording acoustic drum kits starts with an understanding of the mic placement techniques that shape the overall sound of the mix. The different methods not only influence the resulting recording but also determine the flexibility and character that will be available at the mixing stage.
It's important to at least be aware of these approaches, so here are three popular setups:
Close Miking with Overheads
With this method, each drum (kick, snare, toms) is spot-miked to capture its direct sound, and overhead microphones provide a stereo image of the entire kit. This setup offers precise control over individual drum elements and an overall combined sound from the stereo overheads.
Glyn Johns Technique
This minimal setup places two microphones equidistant from the snare, one directly above the kit and another off to the side of the floor tom, along with a mic for the kick drum. The result is a natural, balanced stereo image with fewer microphones and less phase interference.
Room Miking with Spot Mics
Room microphones capture the ambience of the drum kit, adding depth and space to the sound. Spot mics on important drums like the snare and kick capture the definition. This approach is great for creating a blend of room tone and direct sound. Of course, the room itself needs to actually sound good to begin with for this option to be worthwhile.
Understanding these setups provides insight into how the drum tracks were recorded, making it easier to shape your mix around their strengths and limitations.
Balancing the Drum Kit: Levels and Panning
Start the mixing process by organizing the drum tracks with clear labels such as "Kick In," "Snare Top," or "Overhead L." This makes for a smooth workflow. Then, adjust the levels and panning to create a natural, complete stereo image.
Center the kick and snare to anchor the mix. Pan toms and cymbals to reflect their natural positions in the kit or the perspective of the audience. Experiment with panning the overheads wider for a spacious sound or narrower for a more focused mix.
Phase Alignment
With multiple microphones, phase alignment is important to prevent frequency cancellations that can weaken the sound. Phase issues often happen because of slight differences in mic placement. To fix this:
Use the polarity flip function on your DAW for tracks like the snare top and bottom mics. Proper alignment restores low-end punch and overall clarity. Fine-tune overhead and close-mic alignment, and nudging waveforms to sync transients can restore the missing punch.
Phase alignment isn't about strict rules; it's about finding what sounds best for your mix.
EQing Drums for Clarity and Punch
EQ is there for shaping the tone of each drum while maintaining a balanced mix. Here are some general tips:
Kick Drum: Boost around 60-80 Hz for low-end punch and 3-6 kHz for beater click. Use a high-pass filter to remove subsonic rumble if necessary.
Snare Drum: Emphasize 2-5 kHz for brightened attack and reduce boxiness around 400-500 Hz.
Toms: Add fullness by boosting 100-200 Hz and clarity by reducing 300-600 Hz if needed.
Cymbals and Hi-Hats: Use a high-pass filter to remove low-end bleed and tame harshness around 5-12 kHz; a de-esser works well here. A low-pass filter is also an option if they are excessively bright.
Make adjustments that enhance each drum's role in the mix while keeping the overall sound balanced.
Compression Techniques for Drums
Compression controls dynamics, which is desperately needed for an even sound, but also shapes the tonal character of drums. Depending on what the track needs, you can adjust these settings:
Fast attack tames transients, resulting in a smoother sound and enhanced room ambiance. Slow attack preserves transients for a punchier, more dynamic and intimate feel. A moderate ratio (4:1, for example) offers controlled dynamics without overdoing it.
Use bus compression to glue all the drum tracks together, making sure they sit well in the mix without losing their natural energy.
Enhancing Drums with Reverb and Ambience
Reverb adds depth and places drums in a 3D space. Choose the type of reverb based on the track's style, and consider making use of FX buses you're already using elsewhere in your production.
Short reverb adds liveliness and tightens the sound, suitable for faster tracks. Long reverb creates a spacious, ambient feel, ideal for slow songs or cinematic tracks. Room reverb enhances a natural room sound for a realistic tone.
Blend the reverb carefully to make sure it complements and doesn't overpower the drum sound. Very little goes a very long way. You can also pan certain reverb buses to one side, and balance that with having dryer drum sounds further to the opposite side for interesting results.
Parallel Processing: Adding Power
Parallel compression is great for mixing drums. Here's basically how it works:
Send your set of drum tracks or full drum bus to a separate aux channel, so that you have a copy of your signal. Apply heavy compression to the parallel channel with fast attack and high ratio settings. You can also add distortion to emphasize all that even more. Starting at zero volume, blend in the parallel channel with the original drum tracks to add grit and sustain, without sacrificing the dynamics from the original sound, which remains the same.
Parallel distortion or saturation in general can also add nice mids and character, making the drums feel more present in the track.
Using Drum Samples and Layering
Augmenting recorded drums with samples or layering multiple samples is a common and widely used technique to achieve a fuller, more precise sound. It provides better control over the tonality and dynamics, allowing the mixer to build a sound that fits seamlessly within the track.
It also creates a consistent tone across different productions and albums. Check out Andy Wallace, for example: all the kicks and snares sound amazingly similar across dozens of albums.
To begin, analyze the recorded drum's tone. A snare might sound decent on its own but could benefit from reinforcement to cut through or align better with the song's overall vibe. Adding a sample for its attack, sustain, or tonal boost can make a big difference.
Triggering Samples with Hit Points
Most DAWs can detect transients or "hit points" in an audio file. By setting a threshold, the DAW places markers whenever a drum hit occurs. These markers can then be converted to MIDI notes, which are sent to a sampler or virtual instrument loaded with your chosen drum samples.
Using Drum Replacement Plugins
Tools like Slate Trigger or Drumagog simplify this process by detecting hits and triggering samples automatically, with customizable sensitivity and blending options. It's essentially the same principle as the hit point method.
Blending Samples
The key to natural results is blending. Maintain the character of the original recording by keeping the sample subtle. For instance, add a deep kick sample for extra low-end or a snare sample with more attack to enhance clarity. Many producers do completely replace drum sounds on the regular, though. It's all preference.
Drum layering isn't limited to fixing problems; it's an opportunity to get totally creative. Experiment with unconventional samples like handclaps, white noise bursts, or processed tones for unique textures.
Creative Effects: Distortion, Saturation, and Beyond
Once the foundation of your drum mix is solid, creative effects can add character, grit, and warmth to enhance the sound. Effects can either help the drums blend in with your song and be less obvious, or do the opposite and make them stand out.
Distortion and Saturation: These can add a harmonic boost and energy. Apply saturation to the drum bus for warmth or heavier distortion to individual elements like the snare for a gritty, aggressive tone. Tools like tape emulators or analog-style plugins are great for this. They also tend to soften the transients and may help bring the sound into the background.
Full-Bus Processing: Use EQ and compression creatively on the full drum bus to shape the overall tone. A gentle high-frequency lift can make the cymbals shimmer, and low-mid boosts add weight to the kit. Compression with a slower attack can emphasize transients, making the drums feel brighter and snappier, and fast attack/release settings enhance perceived liveliness and bring out the reverbs and sustain.
Finally, think about your broader mix context. Do the drums need to be more subdued, or maybe brighter? Should they stand out or blend into the arrangement? Use these creative tools to shape the drum sound, making sure it complements the rest of the music.
Above anything else, trust your own ears and experiment. You might stumble on a sound that is only yours.