Sound danced from floor to roof beam.

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This fall Portmann will send one to hover over tsunami sensors embedded on the ocean floor to collect data and beam it back to shore.

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The Griffin Twenty is a compact digital amplifier that brings the magic of AirPlay to a pair of bookshelf or floor-standing speakers, so you can beam audio wirelessly from a computer, iPhone, iPad or iPod Touch.

WSJ: Stereo Sound, Rekindled