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There are several reasons why calculated transmission loss in mass regimes can have a large difference with the real transmission loss of panels, especially at high frequencies: Material properties: The actual properties of materials used in panels can vary from the assumed properties used in calculations, leading to discrepancies in the calculated transmission loss. Manufacturing tolerances: Manufacturing tolerances in the production of panels can also affect their acoustic performance, causing differences between calculated and actual transmission loss. Boundary conditions: The actual boundary conditions of the panel can differ from the assumed boundary conditions used in calculations, leading to differences in calculated and real transmission loss. Modeling assumptions: Models used to calculate transmission loss are often based on simplified assumptions that may not accurately reflect the real-world behavior of panels, leading to differences between calculated and actual transmission loss. High-frequency effects: At high frequencies, the behavior of panels can be significantly influenced by effects such as wave scattering, diffraction, and resonances, which are difficult to accurately model and can lead to differences between calculated and actual transmission loss. 🙏

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