That wouldn’t require some way to add energy to the sound?
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There are two things that a cone can do. One is simple – it directs the sound so that it all goes the right direction. There is no extra energy, just less waste.
A “cone” could refer to either the speaker cone or horn shape. The two work very differently but they both do something similar – they improve the acoustic coupling of a sound source. Imagine a spring shaking forward and back. This thing will vibrate a bit of air, making a bit of sound, but it’s tiny. It isn’t making much noise because it interacts with very little air. Even if you keep twanging that spring, it won’t make more sound. Adding some paper will make almost all of the energy become sound because it catches the air. You will have to twang the spring more often because it uses more energy.
Without the paper, the energy is “trapped” in the spring. With the paper it can move into the air much easier.
Likewise a speaker with a cone *will* require more energy than a speaker without, but it will also be able to produce more noise.
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