> 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?
No. Anyway sound goes through solid things as well as air so even if it
couldn't go through the gap it would go through the wall itself.
Try producing a tone that has the exact wavelength of the distance between
your speakers and the doorway :-)
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