Reverberation time
Reverberation time: The heart of room acoustics
Reverberation time is the crucial physical quantity for describing the acoustic properties of a room. It is the direct measure of "reverberation" and significantly influences our well-being, our ability to concentrate, and our enjoyment of music.
What exactly is reverberation time?
Physically defined, the reverberation time ( T 60 ) is the time it takes for the sound level to drop by 60 dB after the source has abruptly stopped.
The duration of this process is influenced by three main factors:
- Room volume: Large rooms naturally have longer reverberation times than small ones.
- Surface properties: Reflective materials such as glass or concrete prolong the reverberation, while absorbers absorb energy from it.
- Frequency dependence: Because materials absorb frequencies differently, the reverberation time varies across the entire pitch spectrum.
Standards and guidelines: DIN 18041 & ÖNORM B 8115-3
In Germany and Austria , DIN 18041 and ÖNORM B 8115-3 define target values for different uses of space.
Requirements according to room type
Offices, classrooms and conference rooms
The focus here is on clear speech intelligibility. Too much reverberation blurs syllables and reduces concentration.
The HSA3 advantage: The smooth, micro-perforated surface of the HSA3 offers a hygienic solution without fiber shedding or dust accumulation. This is a critical factor for air quality in schools and modern office environments.
Event halls and music rooms
These rooms require a complex balance: enough reverberation for full musical sound, but sufficient dryness for speech presentations.
The HSA3 advantage: Unlike thick fabrics that often only dampen high frequencies, the HSA3 allows for frequency-selective control, which keeps the sound image lively.
Recording studios and hi-fi listening rooms
Professional environments (DIN 15996) require an extremely linear frequency response of the reverberation time for maximum neutrality.
The HSA3 advantage: Thanks to its shallow installation depth, the HSA3 integrates more discreetly into high-end designs than massive mineral wool absorbers, without sacrificing precision.
Conclusion: Precision instead of chance
Optimal acoustics result from precise planning. Where conventional materials reach their limits in terms of hygiene, design, or frequency control, modern microperforated solutions like the HSA3 offer the necessary technical flexibility.