Menu OFFECCT
Luna : Read the report (.pdf)
Bass : Read the report (.pdf)
Swell : Read the report (.pdf)
WOBEDO
OFFECCT
Swell Diffuser : Read the report (.pdf)
Soundwave : Read the report (.pdf)
WOBEDO
When sound in a room hits an object or a surface, some of it reflects back into the room while the rest “disappears” or absorbs. A product that serves to absorb sound is called an absorber. A product that spread the sound waves is called a diffuser.
We carried out acoustical tests on our sculptural wall panels Soundwave Swell
& Scrunch as well as on the Soundwave Bass absorber. Our product
Soundwave Diffuser Panes does not absorb sound but helps reducing echo by breaking the sound waves and spreading them in different directions.
The measurements were carried out by SP Swedish International Testing and Research Institute according to SS-EN 20354:93 (ISO 345:1985).
The Bass Absorber Panel is designed to have its best efficiency within 80-500 Hz and the results show that the sound absorption coefficient was 1,00.
The Swell/Scrunch panels are designed to have their best efficiency within 500-5 000 Hz were the absorption coefficient runs from 0,63 up to 0,89.
The sound absorption coefficient is used to calculate the sound absorption class:
A 0,90; 0,95; 1,00
B 0,80; 0,85
C 0,60; 0,65; 0,70; 0,75
D 0,30; 0,35; 0,40; 0,45; 0,50; 0,55
E 0,15; 0,20; 0,25
Not classified 0,00; 0,05; 0,10
Please see the enclosures to see in detail how the panel works at different Hertz. To understand to terminology, please read our section on “what is sound”.
Sound is fluctuations in the air pressure. The variations spread like wave motions and are registered as sound by the human ear. Sound is characterized by its strength or air-pressure (Pasqual) and the number of fluctuations (waves) per second – frequency (hertz). Humans can sense from lower bass-tones at 20 Hertz to high-pitched treble tones of 20 000 Hertz.
20 000 Hz : Highest tones that the human ear can register
4 186 Hz : Highest note on a piano Over
2 000 Hz : S-sounds
800-2 000 Hz : Consonants, phone signals
200-800 Hz : Bass sounds, harmonies in speech
440 Hz : A on a piano
80-300 Hz : Moving around chairs, larger fans
60 Hz : Electrical current
27,5 Hz : Lowest tone on a piano
20 Hz : The lowest tones that the human ear can register
The effect of the sound source is its total radiated sound effect in all directions. The strength is measured with a sound-pressure-meter and the measured unit Lp is indicated in Decibel, dB. The decibel scale for levels of sound pressure is logarithmic with zero chosen to indicate the hearing limit for a human with good hearing. The weakest sound that a human can hear is thus 0 dB.
According to Swedish standard, there is a risk for hearing damages at 8 hours of exposure at sound levels above 85 dB.
194 : Highest possible level of sound
160 : Jet plane
120 : Pain threshold
110 : Rock music
100 : Motorcycle
90 : Traffic noise
80 : Vacuum cleaner
70 : Conversation at 1 m away
50 : Kitchen fan
30 : Whisper at 1 m away
10 : Whispering of wind
0 : Lower limit of human hearing
Infrasound is sound in the frequency range 1-20 Hertz that humans cannot hear but can sense, “be aware of”. Ultrasound has frequencies above the range humans can hear.