Surprisingly effective passive amplifier. 11db increase in volume from across the room, better bass, and a bit of reverb. Cone is made from 2 file folders joined with CA glue, and coated with truck bed liner Tube is a 2" p-trap with a 2" thread adapter and a 3in flush fit cap, painted with hammer...By: TabLeft
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from Instructables: exploring - technology - robots http://ift.tt/1zAFfze
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