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A friend who’d just had a basement theater installed told me that materials tend to absorb sound waves that have wavelength shorter than the thickness of the material.
This is why bass can be heard from outside the club, but you only hear the rest when the door opens.
It’s also why various timer chimes are high pitched. In a place without soundproof walls, that high pitched beep is less likely to disturb your neighbor.
A friend who’d just had a basement theater installed told me that materials tend to absorb sound waves that have wavelength shorter than the thickness of the material.
This is why bass can be heard from outside the club, but you only hear the rest when the door opens.
It’s also why various timer chimes are high pitched. In a place without soundproof walls, that high pitched beep is less likely to disturb your neighbor.