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DIY Perks - How to Build your own Concrete Bluetooth Speaker! | Facebook | By DIY Perks | This concrete outer-shell bluetooth speaker looks fantastic, and what's more, sound produced by the
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Master & Dynamic Built the Gorgeous MA770 Speaker Out of Concrete | WIRED
P.A.C.O open-source concrete speaker uses gestural controls
The Utopia Concrete Bluetooth Speaker is a hefty blend of audio and materials
