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Passive Horn Phone Speaker Dock
This passive desk dock makes a phone's speaker louder without any power. The phone stands upright in a 14 mm slot that is open at both ends, so cases up to about 13 mm thick and phones of any width fit. Its bottom edge rests on shoulders over a 90 mm plenum, which collects sound from bottom-firing speakers wherever they sit along the edge. A 10 x 9 mm bridged duct carries the sound to a front horn that flares from a 12 mm throat to a 47 mm mouth (about 100 x 90 x 45 mm overall). It prints without supports.
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