Orchid XP v8 <voi### [at] devnull> wrote:
> Listening to some music, I observe that most of the drumbeat sounds
> appear to be in the region below 200 Hz.
>
> Wolfram Alpha tells me [EVENTUALLY!] that a 200 Hz sound has a
> wavelength of about 170 cm.
>
> Question: Since the doorway to be bedroom is less than 170 cm wide, does
> that mean those waves can't leave the room? Or does the fact that it's
> more than 170 cm tall negate that?

Neither. It just means that the sound will spread very uniformly in the bedroom:

http://en.wikipedia.org/wiki/Diffraction#Single-slit_diffraction

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