3
votes
Accepted
How does a cardboard paper towel roll amplify the sound?
Quite an interesting project indeed.
The paper towel roll and cups are are working as an acoustic megaphone, also called (in ancient times) speaking trumpet.
Directional focus of the radiating sound ...
1
vote
How does a cardboard paper towel roll amplify the sound?
Pitch content that roughly matches the resonance tendencies of the shape will also get a boost relative to the other frequency content. The resonance frequencies of the tube are probably very limited, ...
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