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A cool physical sound apparatus is a speaker port. This is the hole(s) you may find in some speakers. https://blog.fluance.com/wp-content/uploads/2021/05/Porte

A cool physical sound apparatus is a speaker port. This is the hole(s) you may find in some speakers. https://blog.fluance.com/wp-content/uploads/2021/05/Ported-Vs-Sealed-Speakers.jpg https://blog.fluance.com/wp-content/uploads/2021/05/Ported-V... Is the hole to help get the sound out..? No. As this article shows you, the speaker already moves back and forth, this will create changes in pressure yada yada. The speaker port is not just a hole, it’s a tube. The air in that tube has a mass and due to changes of air pressure inside the box, the air mass in the tube will move back and forth just like a plate in the article. The result is that you basically have 2 “moving plates” which create sound: the speaker cone itself powered by a motor, and the air mass in a tube powered by the air pressure in the speaker enclosure. Cool video about speaker design https://youtu.be/23q3zoKiuGs https://youtu.be/23q3zoKiuGs

xani__ 4y ago
To elaborate, the tube is tuned right below where in closed box the speaker would lose efficiency, so the frequency shift is 180 degrees, and as it takes air from behind it (which is shifted by 180 so it gets to 360 total). But that causes the frequency curve to drop steeper below that. There is also variant of that where instead of pipe hole there is an extra passive membrane https://en.wikipedia.org/wiki/Passive_radiator_(speaker) https://en.wikipedia.org/wiki/Passive_radiator_(speaker)