Modal analysis, focusing on the distribution of eigenmodes, is an essential first step in the acoustic assessment of small rooms. It is particularly important for identifying optimal source or listening positions and for outlining subsequent acoustic treatment strategies for low frequencies. Various approaches, including analytical methods, numerical simulations, and experimental studies, are employed to determine the presence of nodes and antinodes in the sound pressure level (SPL) distribution. This paper presents an analysis of a small rectangular room in the low-frequency range. In contrast to previous studies, this work focuses on the frequency range below the first room mode, which has received limited attention in prior studies. A numerical simulation and an experimental study were conducted in a small rectangular room. To avoid measurement bias related to the employed equipment, two corrective procedures were applied: the frequency response of the loudspeaker used in the measurement and the sensitivities of the microphones were considered. The experimental results were compared with those obtained from a Finite Element Method (FEM) simulation for the frequency band below the first room mode. The influence of evanescent modes on the total sound field within this range is a significant phenomenon that should not be overlooked. The SPL distributions derived from both the FEM simulation and the measurements were further analysed using specific parameters to enable an assessment of the rooms acoustic quality in the low-frequency range.
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