Smartphone speakers have foam balls to help amplify sound. How does that happen?

Question

Smartphone speakers have foam balls to help amplify sound. How does that happen?

In: 81

Answer 1

They mimic a bigger volume of air and provide resonance room for lower frequencies. This comes at the cost of friction losses and damping, but saves space.

Answer 2

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

Answer 3

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

Answer 4

They mimic a bigger volume of air and provide resonance room for lower frequencies. This comes at the cost of friction losses and damping, but saves space.

Answer 5

I could be wrong. But I don’t think they are there to “increase volume” but more to dampen sounds or reverberation. Similar to how foam dampens sound in a room.

Answer 6

I could be wrong. But I don’t think they are there to “increase volume” but more to dampen sounds or reverberation. Similar to how foam dampens sound in a room.

Answer 7

I could be wrong. But I don’t think they are there to “increase volume” but more to dampen sounds or reverberation. Similar to how foam dampens sound in a room.