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Wall absorbers and acoustic panels for walls

Wall absorbers damp early reflections exactly where they disturb: at the first reflection points beside the talker or loudspeaker, on walls between workstations and along long parallel hard surfaces. The absorption comes from the porous core, not the fabric. Good porous panels reach αw 0.8 to 1.0.

The fabric or printed image on an acoustic panel is cosmetic: it is sound-transparent so the sound reaches the porous core behind it. The actual absorption is done by the core material, such as mineral wool, polyester fibre or melamine foam. A decorative picture without a porous core does little acoustically.

Wall absorbers complement ceiling treatment but do not replace it. The ceiling is usually the largest free surface and lowers the overall level across the room most effectively. Wall absorbers act in a targeted way against direct reflections and flutter echoes between opposing hard walls.

Last updated: 28 June 2026

products with measurement data
147
datasets total
1,896
absorption coefficient
αw up to 1.0
measurement method
Reverberation chamber

Wall absorbers with measurement data

Wall-mountable products with stored measurement values, sorted by absorption coefficient.

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  • Acospray DC1αw 1.00

    Acosorb

    Acospray DC1

  • Acospray DC3αw 1.00

    Acosorb

    Acospray DC3

  • aPerf® padαw 1.00

    BK Raumakustik

    aPerf® pad

  • aPerf® panelαw 1.00

    BK Raumakustik

    aPerf® panel

  • aPerf® panel colourαw 1.00

    BK Raumakustik

    aPerf® panel colour

  • aPerf® woolαw 1.00

    BK Raumakustik

    aPerf® wool

  • B11 Archisonic Feltαw 1.00EPD

    B11

    B11 Archisonic Felt

  • FURAL Acoustic Wallαw 1.00EPD

    Fural Systeme in Metall GmbH

    FURAL Acoustic Wall

  • Green Lineαw 1.00

    Acosorb

    Green Line

  • LinePerf®αw 1.00

    BK Raumakustik

    LinePerf®

  • SilentPICTURE Acoustic Pictureαw 1.00EPD

    SilentFiber

    SilentPICTURE Acoustic Picture

  • SilentRoot Torf Acoustic Panelαw 1.00EPD

    SilentFiber

    SilentRoot Torf Acoustic Panel

Wall absorber types compared

Wall absorber types compared
EffectTypical αwLookBest for
Textile / fabric-covered panelBroadband absorption via a porous core0.8–1.0Free choice of fabric colour, calm surfaceOffices, meeting rooms, practices
Melamine / foam panelVery light, strong at mid and high frequencies0.7–1.0Open-pored, often profiledStudios, quick retrofits
Perforated panel / woodResonator effect, tunable via the hole pattern0.5–0.9Visible wood surface, premiumRepresentative rooms, living spaces
Acoustic art (with porous core)Targeted, works only with a porous core0.5–0.9Photo or art print as the motifDecorative retrofits, small areas

Where is the best place for wall absorbers?

Wall absorbers deliver the most at the first reflection points: where sound from the talker or loudspeaker bounces off the wall once on its way to the listener. In practice these are the side walls at head height next to the speaking position, the wall behind a desk or behind monitors, and walls between neighbouring workstations.

Long parallel hard walls create a flutter echo, an audible ringing between the surfaces. A single absorber on one of the two walls already interrupts this path noticeably. The ceiling remains responsible for the overall level, the wall for the targeted reflections.

Mount directly on the wall or with an air gap?

Panels glued or screwed directly to the wall work mainly at mid and high frequencies. If the panel is mounted on a frame or battens with a gap, the air gap markedly improves performance in the low-mid range, because the material then also works where the particle velocity is higher.

The decisive figure for comparison is the weighted sound absorption coefficient αw, ideally from a reverberation-chamber measurement. Check the mounting type stated in the datasheet, since the same absorber gives different values with and without a gap. Reverberation time follows established design targets.

Frequently asked questions

Where should wall absorbers be placed?+

At the first reflection points: on side walls at the height of the talker or loudspeaker, behind the desk or monitors, and on walls between workstations. Long parallel hard walls cause flutter echoes, where one absorber on a single side is often enough. The ceiling lowers the overall level, the wall damps the targeted reflections.

How many wall absorbers or how much area do I need?+

A rule of thumb is 0.15 to 0.25 m² of high-performance absorber per square metre of floor area, starting at the ceiling and complemented by the wall. A 25 m² room therefore needs about 4 to 6 m². For a reliable design, reverberation time is calculated, and the reverberation calculator uses the stored measurement data.

Should acoustic panels be mounted with or without an air gap?+

Directly on the wall, panels work mainly at mid and high frequencies. An air gap from mounting on a frame or battens markedly improves the low-mid range. Which αw value applies depends on the mounting type, so the datasheet states whether it was measured directly or with a gap behind the panel.

Can wall absorbers be printed with a motif?+

Yes. The cover fabric or printed image on an acoustic panel is sound-transparent and cosmetic, while the porous core behind it does the absorbing. A printed acoustic image therefore works acoustically as long as it has a porous core. What matters is not the motif but the core material and the stated αw value.

What fire class should wall absorbers have?+

The decisive figure is the fire class, from A1 (non-combustible) to F. In ordinary living and office spaces it is rarely mandatory, but it is required in escape routes and certain public buildings. You can filter by minimum fire class in the search.

What is the difference between a real absorber and an acoustic image?+

A real wall absorber has a porous core, such as mineral wool, polyester fibre or melamine foam, and reaches αw 0.8 to 1.0. A decorative picture without a porous core absorbs almost no sound. An acoustic image works only if a porous core sits behind the printed fabric, shown by the stated αw value.

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Compare all wall absorbers and acoustic panels with measurement data and filter by αw, material and fire class.

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