Designed acoustic system for acousticians

Architects’ visions and desires to bring a distinctive character to the objects they design often include huge challenges to realize in practise especially when it comes to the acoustic environment in the rooms.

Designs with vaulted shapes, specific structures, carefully selected colours, glass, stone and concrete. These are the choices that limit the possibilities to shape high acoustical performance. Architects’ visions and desires to bring a distinctive character to the objects they design often include huge challenges to realize in practise especially when it comes to the sound environment in the rooms.

Standards

Different national standards, as for example the Swedish standard SS 02 05 68 is a form of sound-transmission classification standards for premises where it is established that you should also show consideration for the low frequencies below 250 Hz, especially in rooms that you stay regularly in. A number of acousticians in Sweden have begun to raise their voices in order to clarify the importance of this and that you are easily misled to believe that you have taken enough measurements since you have chosen an absorbent with a very high aw. Although this value is merely on the average it does not point out anything about how good that absorbent is at frequencies below 250 Hz. Most of the absorbents on the market are quite inadequate at these frequencies, with the exception of cases in which allows a large construction height which in most cases are proven not to be possible due to technical reasons.

Fellert Acoustic System

Sounds above 500 Hz are as you know relatively easy to absorb. These are absorbed by the interior of the room and also by people who reside there. Almost all sound absorbents on the market manage to attenuate these sounds with good results. Sounds below 500 Hz are considerably harder to absorb.

Fellert Acoustic System is unique in this regard as it manages to absorb sounds in the frequencies below 500 Hz without the need of an underlying air gap. The construction height will then only measure a few centimetres. Fellert has in spite of its low construction height clearly the best test values in these low, difficult frequencies. See the charts to the right.

Our aim during the development phase of our acoustic system:

  • The product should be independent of underlying air gaps as far as possible. We would prefer that it will have equal absorption irrespective of if it is closed mounted, entirely without air gap, or, as if there is a gap to the ceiling of 1, 2, 3 etc. decimetres.
  • That it could be applied to both walls and ceilings since you in some extreme cases need to cover a larger area with absorption material, or, if you do not have the possibility to use the ceiling as an absorbent.
  • We would like to maintain an extremely low construction height, for greater flexibility. It affords us more opportunities to meet the architects’ demands on shape and colour without lowering the quality of the absorption.

    • Do you require additional documentation than what is available on our webpage? Do not hesitate to make contact with us so that we could assist you with additional information!!

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