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Originally Posted by terminal pharmacy
what you are describing is called a standing wave, this occurs when the wave form is as long as the distance between your walls. for example a 20hz sine wave is approximately 17 meters wide, so if you have a room 17 meters wide that frequency will bounce from one wall to the other quite easily, as it hits each wall it loses approximately half of its power which is about 6db. this makes that frequency sound for longer than all others in the room.
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Thanks for giving me a name.