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Amazon.com: Acoustic Phone Amplifier
DIY Acoustic Smartphone Amplifier (Wooden Passive Speaker)
DIY phone speakers that rock (and a few to avoid) - CNET
DIY Wooden Phone Speaker: Build Your Own Passive Phone Speaker …
Make your phone louder with this DIY wooden speaker
Amazon.com: Acoustic Iphone Speaker
Acoustic Phone Speaker - Etsy
Wooden Phone Amplifier/Speaker (no cord or batteries needed)
Wooden Amplifying Phone Speaker - Uncommon Goods
Build a Wooden Passive Speaker for Smart Phone or Tablet