Speaker made of reusable materials
Old cars’ speaker elements are scrapped with them. Frequently they are usable and sometimes high-quality speakers. The idea is to build a stiff cardboard box and put a reused speaker into it wirelessly. Cardboard is reused paper and also speaker element is reused. Amplifier and bluetooth connection should be new ones. The only wire could be power cable.
Knowledge needed to team: electronics and sound specialists
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