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A lot of drivers have a rising (on-axis) response in that range. However I'm guessing the answer is the inductance of the voice coil?
Flat impedance.
What makes a dynamic driver (moving coil cone speaker) have flat frequency response over it's range of comfort as defined on the bottom end by resonance of the driver in it's enclosure and the top end by cone break-up.
Oh, you're saying that it's because the acceleration of the cone with frequency (for a given input voltage) is constant?
Assuming a direct-radiator speaker, if the linear displacement of the cone quadruples with each halving of frequency (or decreases by a factor of 4 for each doubling of frequency), the on-axis response will be flat but the power response probably will not be. This same relationship can be expressed in different terms.This relationship between displacement and on-axis SPL changes with various types of horn loading.
It's been way too long since I thought about Kinematic Equations and what not; so I'm out of my comfort zone. I'll keep reading, though.