Passive speaker
thingiverse
To boost low-end sound in portable speakers, install a human speaker, specifically designed for enhanced bass response. To prepare, apply 2-3mm of silicone lubricant to the mold halves, position two gauze or bandage pieces between them at a 45-degree angle to each other, and secure under load. After curing, carefully trim excess material and attach the ring and disk to the speaker membrane.
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