SOUEND

Science — Engineering

The physics of architectural silence.

Sound is a wave of pressure. Architecture is a vessel that either lets it bloom or quietly absorbs it. Our work begins where these two disciplines meet.

Acoustic research room with sculptural wave-pattern baffle ceiling

01 — Sound Insulation

Stopping sound from passing through.

Insulation (Rw, in dB) measures how much energy a partition blocks between two rooms. It is a function of mass, decoupling and damping — heavy layers separated by limp air cavities perform best. SOUEND insulation systems combine high-density foam membranes with resilient mounting to reach Rw > 55 dB without bulking out the wall.

  • RwWeighted sound reduction index (ISO 717-1)
  • Mass lawDoubling mass adds ~6 dB of insulation
  • DecouplingAir gaps + resilient channels break the bridge
  • DampingViscoelastic layers convert vibration into heat

02 — Sound Absorption

Stopping sound from coming back.

Absorption (α, NRC) measures how much energy a surface dissipates instead of reflecting back into the room. Open-cell foam converts acoustic pressure into microscopic friction inside its pores. Variable density tunes that friction across the spectrum — from deep bass at 125 Hz up to the air of 8 kHz.

  • αAbsorption coefficient per frequency (ISO 354)
  • NRCAverage across 250 Hz – 2 kHz
  • AirflowResistivity tuned to band of interest
  • RT60Time for sound to decay by 60 dB

Frequency map

A different problem at every octave.

Human hearing spans roughly 20 Hz – 20 kHz, but architectural acoustics focuses on the 125 Hz – 8 kHz band. Each octave behaves differently and needs a different material strategy.

Sound wave frequency spectrum visualisation

125 Hz

Low — bass rumble, HVAC, traffic

Mass + air gap behind panel

250 Hz

Low-mid — male voice fundamentals

Variable-density foam core

500 Hz

Speech intelligibility region

Calibrated airflow resistivity

1 kHz

Critical band for clarity

Open-cell surface absorption

2 kHz

Consonant articulation

Layered melamine micro-pores

4 kHz

Brilliance, sibilance

Fine-pore polyester finish

8 kHz

Air, ambience

Soft fabric wrap diffusion

Physics — CELLOFOAM Materials

One law, many materials.

A sound wave's wavelength λ equals the speed of sound c divided by its frequency f (λ = c / f). At 100 Hz a wave is over three metres long; at 4 kHz it is barely eight centimetres. No single material can absorb both — efficient absorption requires a porous depth of roughly λ/4. CELLOFOAM answers this with a family of foams, each engineered for a specific slice of the spectrum.

  • λ = c / fWavelength shrinks as frequency rises
  • λ/4 ruleOptimal porous absorber depth
  • HelmholtzResonant cavities target narrow low bands
  • MembraneFlexible mass tuned to bass frequencies

  • Melamine BASF Basotect®

    500 Hz – 8 kHz

    Open-cell, micro-porous absorber

    Ultra-light, Class A fire-rated foam with very low airflow resistivity. Dissipates mid and high frequencies through viscous friction inside its 3-D melamine matrix.

  • Polyester PET Fibre

    250 Hz – 4 kHz

    Pressed fibre absorber

    Up to 60% recycled PET pressed into variable-density boards. Calibrated airflow resistivity for broadband speech and clarity in workspaces.

  • Polyurethane Composite

    125 Hz – 1 kHz

    Variable-density layered absorber

    Layered PU cores with graded density to extend absorption into the low-mid band — where speech fundamentals and HVAC drones live.

  • Heavy-Mass Membrane

    63 Hz – 250 Hz

    Tuned membrane / mass-spring

    Limp mass layer over a sealed air cavity. Behaves as a tuned resonator that absorbs bass energy where porous foams become transparent.

  • Perforated Panel + Foam

    100 Hz – 500 Hz

    Helmholtz resonator array

    Wood or metal facing with calibrated perforation over a foam-filled cavity. Targets specific low-frequency room modes without bulky bass traps.

  • Felt Composite

    500 Hz – 4 kHz

    Surface absorber + diffusor

    Soft fibre felt finishes that combine absorption with high-frequency scattering — the architectural skin of the system.

Partner — CELLOFOAM

Altmış yıllık Alman akustik mühendisliği.

SOUEND akustik sistemlerinin çekirdeğindeki köpük teknolojileri, Almanya Biberach merkezli CELLOFOAM tarafından üretilir — 1959'dan bu yana otomotiv, mimari ve endüstriyel ses kontrolünde referans kabul edilen bir mühendislik firması.

1959

Kuruluş

Biberach an der Riss, Almanya'da köpük işleme atölyesi olarak kurulur.

1970s

Otomotiv dönemi

Alman otomotiv endüstrisine özel akustik yalıtım çözümleri geliştirir.

1990s

Mimari akustik

Yapı içi ses kontrolü için Basotect® bazlı panel sistemleri serisi.

2000s

Global ölçek

Avrupa, Kuzey Amerika ve Asya'da üretim tesisleri; OEM tedarikçi statüsü.

2010s

Sürdürülebilirlik

Geri dönüştürülmüş PET fiber ve düşük emisyonlu üretim hatları.

Bugün

60+ yıl tecrübe

500'den fazla çalışan, 6 üretim tesisi, 40+ ülkeye ihracat.

Referanslar

Dünyanın en zorlu üreticileri için ses kontrolü.

CELLOFOAM köpükleri; titreşim, motor sesi ve kabin akustiği açısından en yüksek standartların uygulandığı otomotiv ve ağır ticari araç üreticilerinin OEM tedarik zincirinde yer alır. Aynı malzeme bilimi, bugün SOUEND'in mimari akustik panellerinin temelini oluşturur.

  • Mercedes-Benz
  • MAN Truck & Bus
  • BMW Group
  • Audi
  • Volkswagen
  • Porsche
  • Daimler Truck
  • Scania
  • Bosch

Engineering workflow

From measured room to designed silence.

  1. 01

    Measure

    On-site RT60 and noise floor capture, room geometry survey.

  2. 02

    Model

    Ray-tracing simulation against target reverberation curve.

  3. 03

    Specify

    Material, thickness and coverage tuned per octave band.

  4. 04

    Verify

    Post-install measurement vs. ISO 354 lab data.

Bring us a room. We'll bring you the numbers.

Request an acoustic study →