SELTECH NC52W33DF8, Design Manualline

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Back volume
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Min. wall thickness to avoid wall resonating (depends on material)
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Avoid « wall-to-wall-design » (e.g. antenna module)
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Vibrations can cause rattling noise

Use « sandwich » for applying the speaker (foam-gasket, speaker, hard
support at rear side)
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No heat-radiating components inside the back volume

Etc.
… Mechanical robustness