Wood Acoustic Phone Amplifier by Audio Tree available at Scoutmob now. The place to get inspired goods by local makers.
Victrola Style Passive Speaker - amplify your cell phone, old school style!
The loudbasstard™ bamboo amplifier enables you to share your music through passive sound amplification.
This wooden passive speaker is simple to build, inexpensive in terms of materials and makes a fantastic gift for anyone who owns a smartphone or tablet.
DIY Plans: Make Your Own Wooden iPhone Amplifier Red Bird Blue + Woodwork City .Maybe use pallet wood