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Passive 1870's sound amplificator

by DigitalTargeter, published

Passive 1870's sound amplificator by DigitalTargeter Oct 30, 2012

Description

Horn amplificator for your IPhone 4/4s

based on the ducts found on good old gramophones!

Amplifies the sound pressure from 70dB to 85dB ;)

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Instructions

I have printed both parts on my ultimaker using netfabb

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