Low Frequency Lab
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Low Frequency Lab
Low Frequency Lab
![](/f/6/_processed_/7/2/csm_UOLPressurechamber1_2680f9669c.jpg)
The investigation of human sound perception (e.g. the determination of equal level loudness contours) at low frequencies requires high sound pressure level that cannot be obtained in a large anechoic chamber with reasonable sized loudspeakers. Therefore, a small room excited by two 18" loudspeakers is used as a pressure chamber to reproduce low frequency sound down to a few Hertz. The room has a very low background noise level of about 21 dB(A) and an average reverberation time of 0.2 seconds. The room is outfitted with a small vibration plattform, which can be used to present vertical whole-body vibrations.
The room was used in the EU-project RUMBLE to accurately reproduce low sonic boom signatures.
![](/f/6/_processed_/8/9/csm_TechSetup6_96d4c5b654.png)
Scheme of the technical setup of the low frequency lab.