| http://www.w3.org/ns/prov#value | - ???Concrete walls, especially painted concrete walls, are a highly reflective surface so what happens is the sound comes down, hits the wall and it acts just like a mirror and that sound wave comes back a second time,??? he said. ???So what happens is you hear the direct sound from the speaker and then you hear the indirect sound from the wall reflection,??? Engen said.
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