Below shows how a loudspeaker is made of. It is a typical "woofer" construction unlike tweeter, compression driver, piezo or whatever. This is the most commonly known type and will be discussed most.
Sound Representation on Scientific Terms
3D movement of 13.8Hz
2D movement 13.7Hz
But no speaker is perfect
Because of Cone Break-up
Radiation is frequency dependent
Therefore no speaker has flat frequency response
Why do we need flat frequency response?
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