Smartphone speakers have foam balls to help amplify sound. How does that happen?
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The foam balls make the speaker “see” the enclosure as a larger volume based on a few different, linked reasons. The foam balls dissipate heat in the enclosure, and conversely lower the air pressure inside, creating what works out to an acoustically larger enclosure volume. This also works to slow down the air inside the enclosure and provide more dampening force. The slower air movement translates acoustically to a larger volume also. Depending on the design of the speaker you can expect 10-25% increase in acoustic volume, and it’s accompanied effects on speaker performance
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