Edge absorber
Edge absorbers: The strategic solution for the bass range
In room acoustics , edge absorbers (often referred to as "bass traps") are the specialists for low frequencies. Their name derives from their strategic positioning: they are specifically installed in room corners or along the edges between the wall and ceiling.
The physical phenomenon of the room corner
Below the cutoff frequency , room modes (standing waves) dominate the acoustics. This results in the bass booming in some areas and almost completely absent in others.
Rectangular rooms have a unique acoustic characteristic: all room modes exhibit a maximum sound pressure in the outermost corners. The room corner thus acts as a focal point for low-frequency energy.
Conventional boundaries: Porous bass traps
Traditional edge absorbers usually consist of bulky, porous materials such as foam or mineral wool. To dampen low frequencies, these materials must slow down air movement (sound velocity).
Since there is no air movement directly in the corner, conventional absorbers must be extremely large and extend far into the room to reach the area of sound velocity in front of the corner. The lower the frequency, the more massive the absorber must be.
HSA3: The modern alternative for the corner of the room
The HSA3, as a micro-perforated system, utilizes the principle of resonance. Unlike porous materials, it works most effectively where the sound pressure is highest – i.e., directly on the wall surface in the corner.
- Space-saving efficiency: The HSA3 can be mounted directly as a slim element and does not take up valuable living or working space due to huge volumes.
- Architectural integration: Instead of stacked blocks, the HSA3 offers a smooth, aesthetic surface or even transparent versions made of acrylic glass.
- Hygienic advantage: In dust-prone corners, the smooth, fiber-free surface of the HSA3 scores points for easy cleaning – ideal for allergy sufferers.
The use of the HSA3 in room edges is the most technologically advanced method to efficiently control booming bass without compromising the room's aesthetics.