How to Make Metalcore Synths Sound Huge: The Wall of Sound Method

You’ve got the riffs. You’ve got the drums. But next to a Bring Me The Horizon or Bad Omens track, your metalcore synths still sound… thin. The missing piece is almost always the same thing — the layered synth production underneath the guitars that you feel more than you hear. The wall of sound. Here’s how to build it.

Why metalcore synths make or break a modern mix

Modern metal isn’t just guitars and drums anymore. Bands like BMTH, Bad Omens, Sleep Token and Spiritbox build an entire electronic architecture under their riffs — sub-bass, pads, risers and leads — that makes the whole track feel massive. Get your metalcore synths right and your production sounds finished. Skip them and no amount of mixing will close the gap. The good news: it’s a system, not magic. We call it the Wall of Sound.

The three-layer system

Every great metalcore synth arrangement breaks into three layers. Build them in this order, every time:

Layer	What it does	Golden rule
Low	Sub + synth bass — the weight	Mono, below the guitars
Mid	Pads + atmosphere — the glue	Never louder than the guitars
High	Leads, plucks, sparkle — the ear candy	Movement, not mud

One rule above all: synths serve the guitars. If an element fights the riff, it loses.

Layer 1: the bass that sits under your guitars

Your synth bass should support the low end without muddying it. In Serum, start with a saw plus a sub oscillator, a touch of unison, and a low-pass filter around 300–600 Hz. Keep everything below 120 Hz in mono so it stays tight.

The pro move: map one macro to the distortion amount. Now you have a single bass patch for the whole song — clean in the verses, full grit in the choruses — just by automating that one macro. No more switching between five basses that never quite sit right.

Layer 2: pads that fill the wall

Pads are the glue. Two detuned saws plus a little noise, a slow attack around 300–600 ms, and 30–40% reverb gets you most of the way there. High-pass around 200 Hz so they don’t clash with your palm mutes, and keep them wide — pads should be the widest element in your mix. The trick is volume: a pad should fill every gap the guitars leave, but you should never consciously hear it. If you notice the pad, it’s too loud.

Layer 3: leads and plucks with movement

This is where the track gets its identity. For leads, reach for a unison saw or square with a little portamento and a dotted-eighth delay. For plucks, run a fast decay envelope into the filter, then sidechain them to the kick so they pump with the groove. Boost presence around 3 kHz and add air at 12–16 kHz to make leads cut through without getting harsh.

Metalcore synth EQ cheat sheet

Keep this chart next to your DAW. These are reliable starting points for each synth layer — boost to add character, cut to fix problems, and filter to keep every layer in its own lane. Trust your ears over any number, but start here.

Synth layer	Boost (add)	Cut (fix)	Filters
Sub / synth bass	Sub 50–80 Hz · klank 1.8–2.6 kHz	Mud 200–500 Hz	HP 60 Hz · LP 8 kHz · mono
Pads & atmosphere	Air 10–16 kHz	Mud 150–300 Hz · box 500–900 Hz	HP ~200 Hz · keep wide
Leads & plucks	Presence 3 kHz · air 12–16 kHz	Box 500–900 Hz · harsh 6 kHz	HP 120 Hz

The one mix move that ties it together

Here’s the move that cleans up almost every heavy mix: split your synth bus around 600 Hz. Compress the low band hard, and sidechain the high band to your guitars. Now the synths breathe when the guitars breathe and duck when they hit. The mud disappears and the clarity arrives — and it’s one routing decision, not an hour of EQ.

Arrange it: full wall vs minimal

Don’t run all three layers for the whole song. The secret to a track that feels huge is contrast — so change what the synths do from section to section:

Section	Synth layers	Goal
Verses & calm bridge	Minimal	Support the mood, not the size
Pre-chorus	Layers enter one by one + riser	Build tension into the drop
Choruses, breakdown, ending	Full wall — all three layers	Maximum size and impact

The shortcut: start from mix-ready presets

You can dial all of this in from scratch — or you can start from sounds that are already mix-ready. Impact X is a pack of 300+ cinematic rock Serum presets built for exactly this: bass, pads, leads and impacts that sit under heavy guitars out of the box. Everything is built in Serum, so every patch stays fully editable once you load it.

And if you want the entire system — drums, bass, pads, leads and the mix, built on a real metalcore track from start to finish — that’s exactly what the Modern Metal Producer course walks you through, step by step.

The takeaway

Huge metalcore synths aren’t about one magic plugin. They’re three layers — low, mid and high — built in order, sitting under your guitars, and arranged for contrast. Nail that, and your mixes stop sounding thin and start sounding like the records you’re chasing.