from above:
I'd be careful what you wish for with upgrades and parts. I've had several speakers with great parts that made my ears ache or ring when played at much lower than safe levels. Frequency has much more to it than can be easily measured.
Trust me, the difference between the stock crossover parts, plus the damping of horns and woofer frames, plus the isolation from the floor on even the cheapo rubberized cork pads.... all of these make the speaker FAR better than the stock one. Not even close to my ear. The stock version is very dynamic, but it is a tad bright. These changes actually improve detail, realism, tone and imaging, and eliminate the brightness. I know people with stock ones don't think they are bright, but they are way better this way and retain all of the things you love about them, and you dont' realize they are bright until you get those cheap caps and and resistors replaced with much better parts. My 2 cents, enjoy your Cornwalls, however they are:).