There is a review of the C452-AIR on the way, btw, with full measurement sets. The folded diaphragm is made out of Kapton, not paper.
Here is another great review of the MK402 that likewise explores its behavior in depth. Anyway, as that review and my review says, you don't need really DSP correction curves to greatly improve the sound of these speakers; the way the response is shaped, a simple tone control is just about perfect for taking down that treble for a very smooth response.