One of the major issues in small room acoustics is low frequency response and behavior. The goal of this paper is to present how and in what magnitude different commercially available low frequency absorbing devices control low frequencies and how off-the-shelf computer based simulation programs can be used to predict the low frequency behavior of small rooms. Reproducible acoustical measurements have been taken in a completely untreated rectangular concrete room, sequentially with and without a total of eight different absorbing devices as courteously provided by eight different international manufacturers. Results are compared and conclusions are presented.
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