Why Your Sub Bass Sounds Weak
Sub bass is the foundation of every bass music track. It is the weight you feel in your chest at a club, the rumble that shakes car subwoofers, the low end that separates amateur productions from professional ones. If your sub bass sounds thin, muddy, or disappears on smaller speakers, this guide will fix that.
Getting the Fundamental Right
Waveform Choice
For sub bass, a pure sine wave is usually the best starting point. It produces a single frequency with no harmonics, giving you the cleanest possible low end. In Serum, use the Sub Oscillator set to a sine wave, or use Oscillator A with the Basic Shapes wavetable on the first position (pure sine).
Sometimes a pure sine is too clean and disappears on smaller speakers that cannot reproduce very low frequencies. In that case, add a tiny amount of saturation or use a triangle wave instead, which has subtle odd harmonics that help the sub translate.
Pitch and Range
Sub bass operates between roughly 30Hz and 80Hz. Notes below 30Hz are mostly felt rather than heard, and notes above 80Hz start to sound more like a bass guitar than a true sub. The sweet spot for most bass music is between E1 (41Hz) and A1 (55Hz).
If your sub notes go below E1 (41Hz), consider raising them an octave. Very low sub notes (below 35Hz) lose definition and can sound like rumble rather than a musical note. You can always layer a higher bass element on top for the musicality.
Making Sub Bass Hit Harder
Saturation for Weight
Light saturation adds harmonics above the fundamental frequency. These harmonics help your brain perceive the sub bass even on speakers that cannot physically reproduce those frequencies. This is called the “missing fundamental” effect.
In Serum, add the Tube distortion in the FX tab at low levels (10-20% drive). Outside Serum, use a subtle saturator like Ableton Saturator with the Analog Clip curve or FL Studio Fruity Soft Clipper. The key word is subtle. Too much saturation destroys the clean low end you want.
Envelope Shaping
The attack and release of your sub bass envelope massively affect how hard it hits. A very fast attack (0-5ms) creates a click at the start of each note that adds punch. A medium release (50-200ms) lets the sub ring out naturally without overlapping with the next note.
Try adding a very slight pitch envelope: start 2-3 semitones above the target pitch and drop quickly (10-30ms decay). This creates a subtle “thump” at the start of each note that makes the sub feel more impactful without adding unwanted frequencies.
Mono Below 200Hz
Sub bass must be mono. Any stereo content below 200Hz creates phase cancellation that weakens the low end. In Serum, make sure your sub oscillator has no unison, no stereo width, and no stereo effects.
Use a utility plugin after Serum to ensure mono below 200Hz. In Ableton, the Utility plugin has a Bass Mono switch. In FL Studio, use Stereo Shaper or a mid-side EQ to mono the low end.
Compression for Consistency
Gentle compression on sub bass keeps the level consistent across different notes. Different notes have different volumes even with the same velocity, because of room acoustics and speaker response curves. Use a compressor with a ratio of 2:1 to 4:1, medium attack (10-30ms), and medium release (50-100ms).
Sub Bass in the Mix
High-Pass Your Other Elements
The biggest reason sub bass sounds weak is not the sub itself. It is other elements competing for the same frequency space. High-pass everything except the sub and kick at 80-120Hz. This includes your mid bass, pads, vocals, samples, and effects. Give the sub room to breathe.
Sidechain to the Kick
The kick and sub bass share the same frequency range. Sidechain compression ducks the sub bass when the kick hits, preventing them from stacking and creating a muddy mess. Use a fast attack and medium release for a clean, punchy interaction.
Check on Multiple Systems
Always check your sub bass on headphones, studio monitors, a car stereo, and phone speakers. If the sub sounds good on all of these, it will sound good everywhere. If it disappears on small speakers, add more subtle saturation to create those helpful harmonics.
Use a Spectrum Analyser
Visual feedback helps when working with frequencies you can barely hear. Use a spectrum analyser (SPAN by Voxengo is free) to see your sub bass level relative to other elements. The sub should be one of the loudest elements in the 40-80Hz range.
Sub Bass Presets
Our Serum preset packs all include clean sub bass patches designed to sit perfectly under the main bass sounds. The sub presets are simple by design: they provide weight and foundation while the mid-bass presets carry the character and aggression.
Get the complete set in the Dirty Bass Master Bundle.
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