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<p>When sound from a <a href="page.php?w=loudspeaker">loudspeaker</a> collides with the walls of a room, part of the sound's energy is <a href="page.php?w=reflection_%28physics%29">reflected</a> back into the room, part is transmitted through the walls, and part is absorbed into the walls. Just as the acoustic energy was transmitted through the air as pressure differentials (or deformations), the acoustic energy travels through the material which makes up the wall in the same manner. Deformation causes mechanical losses via conversion of part of</p><p>
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