Serum Filter Types Explained – Choosing the Right Filter for Bass

Why Filters Matter for Bass

Filters are one of the most important tools in bass sound design. They shape the frequency content of your sound, controlling which harmonics are heard and which are hidden. In Serum, you have access to a huge selection of filter types, and choosing the right one can be the difference between a bass sound that cuts through a mix and one that disappears.

Understanding filters is not just about knowing what low-pass and high-pass mean. It is about understanding how different filter models respond to bass frequencies, how resonance interacts with low-end content, and how filter characteristics change the feel and impact of your sounds.

Low-Pass Filters for Bass

Low-pass filters cut high frequencies and allow low frequencies through. They are the most commonly used filter type for bass because they let you control how bright or dark a bass sound is without affecting the fundamental low-end energy.

MG Low 12 and MG Low 24

These are modelled after the classic Moog ladder filter. The MG Low 24 (4-pole) has a steeper slope, cutting more aggressively above the cutoff. It is the go-to for deep, warm bass sounds where you want to completely remove the high frequencies and keep only the low, round fundamental. The MG Low 12 (2-pole) has a gentler slope that lets more harmonics through for a more open, present tone.

The MG filters handle resonance beautifully for bass. At low resonance, they are smooth and warm. As you increase resonance, they add a subtle nasal quality that can help bass cut through a mix. Be careful with high resonance on low-pass filters though, because it can thin out the low end by creating a peak at the cutoff frequency.

SV Low (State Variable)

The state variable low-pass has a cleaner, more precise character than the MG filters. It does not add as much warmth or colour, which makes it ideal when you want transparent filtering that shapes the frequency content without changing the character of the sound. Good for clean sub bass where you just need to remove unwanted highs.

High-Pass Filters for Bass Layering

High-pass filters cut low frequencies and pass high frequencies. In bass production, you use these on mid and top layers to create space for the sub bass underneath. Every good bass music mix separates the sub from the mid-range, and high-pass filters are how you do it.

Set a high-pass filter on your mid bass layer at 80-200Hz depending on where you want the split between sub and mid. The MG High 12 gives a gentle transition that blends well. The MG High 24 creates a sharper division. Choose based on whether you want the layers to overlap slightly or stay completely separate.

Band-Pass Filters for Focused Bass

Band-pass filters pass a narrow range of frequencies and cut everything above and below. They are incredibly useful for isolating specific frequency ranges in your bass sound design. When you want a nasal, vocal, or telephone-like quality, a band-pass filter with some resonance is the way to go.

Modulating a band-pass filter cutoff with an LFO creates classic wobble bass sounds. The sound opens and closes in a narrow band, creating that characteristic wah-wah effect. This technique is fundamental to dubstep, riddim, and many other bass music styles.

Comb Filters

Serum includes comb filters that create metallic, resonant tones by feeding the signal back into itself with a short delay. These are excellent for creating harmonics and overtones that would not exist in the original waveform. Use them sparingly on bass sounds for a metallic edge, or crank the feedback for extreme, self-oscillating textures.

Filter Drive and Saturation

Many of Serum filters include a drive parameter that adds saturation before the filter. This is different from adding distortion after the filter, and the result sounds distinctly different. Pre-filter drive pushes more harmonics into the filter, which then shapes them. This creates a warm, overdriven tone that feels more organic than post-filter distortion.

Try cranking the filter drive on a low-pass filter while keeping the cutoff fairly low. The drive generates harmonics, and the filter rolls them off, creating a thick, warm bass tone with lots of presence but no harshness. This is one of the quickest ways to get a fat, analogue-style bass in Serum.

Using Two Filters Together

Serum lets you use Filter 1 and Filter 2 simultaneously in serial or parallel routing. This opens up advanced filtering possibilities. In serial mode, the signal passes through Filter 1 first and then Filter 2. In parallel mode, the signal goes through both filters simultaneously and the results are mixed.

A powerful combination is a low-pass on Filter 1 and a high-pass on Filter 2 in serial mode. This creates a band-pass effect, but you have independent control over the low and high cutoff points. Modulate them independently for complex, evolving filter movements that would be impossible with a single filter.

Another useful combination is two low-pass filters at different cutoff points in parallel. This creates a phaser-like effect when the cutoffs are close together and the filters interact. Modulate one filter slowly while keeping the other static for shifting, phasing textures. Browse the Preset Drive shop for presets that demonstrate creative filter usage in bass sound design.

Choose the Right Filter for Your Sound

There is no single best filter type for bass. It depends on the sound you are trying to create and the context it sits in. Experiment with different filter models on the same oscillator setup and listen to how each one changes the character. Over time, you will develop an instinct for which filter to reach for in different situations.

Grab the Free Serum Taster Pack and study how the presets use different filter types. Then check out the full collection for more examples of expert filter design in bass music contexts.