Bass Traps: Why Corners Matter

April 10, 2026

Bass Traps: Why Corners Matter

The science behind low-frequency build-up and how to fix it

Bass is the hardest acoustic problem to solve in any room. Unlike mid and high frequencies, which can be absorbed with relatively thin panels, low frequencies have long wavelengths that pass straight through lightweight materials and build up in predictable places. The most predictable of all: your corners.

Understanding why corners are problematic, and what to do about it, is the foundation of effective acoustic treatment.

Why Bass Builds Up in Corners

Sound behaves like a wave. When a bass frequency travels through a room and hits a wall, it reflects back. When two reflected waves meet, they interact, sometimes reinforcing each other (causing a peak) and sometimes cancelling each other out (causing a null). These interactions are called room modes.

Corners are where three surfaces meet: two walls and a floor (or ceiling). This means bass energy from all three axes of the room converges at the same point. The result is that corners experience the highest sound pressure levels in the room, often dramatically higher than anywhere else.

This is why untreated rooms sound boomy and muddy at low frequencies. The bass isn't evenly distributed, it's piling up in the corners and creating peaks that colour everything you hear.

How Bass Traps Work

Bass traps work by converting sound energy into heat through friction as sound waves pass through a porous material. The material density matters enormously, but not in the way most people assume.

Higher density isn't always better. High density materials are excellent for broadband mid and high frequency absorption, but can actually begin to reflect low frequencies rather than absorb them, because the material becomes too rigid to allow the air movement that low-frequency absorption depends on.

Effective bass absorption requires a material that is open enough to allow air movement as the sound wave passes through it. This is why our bass traps use a 45kg/m³ Rockwool acoustic core, the sweet spot that provides enough resistance to absorb energy across a wide frequency range, while remaining sufficiently porous for low frequencies to interact with the material rather than bounce off it.

Placing these traps in corners where pressure is highest gives you the maximum return on every panel. A bass trap in a corner does the work of multiple panels placed elsewhere.

Key principle: Treat where pressure is highest. In almost every room, that means the floor-to-ceiling corners first, then the wall-to-wall corners behind and beside your listening position.

Where to Place Bass Traps

Floor-to-ceiling corners	The highest priority. All four vertical corners of the room, particularly those behind and beside the listening position.
Tri-corners	Where walls meet the ceiling or floor. Extremely high pressure, treat these if you have persistent bass problems after treating vertical corners.
Rear wall	The wall behind your listening position. Bass traps here help control rear-wall reflections and reduce low-end build-up at the mix position.