Subaruguru...I suppose that making chicken soup can be turned into rocket science! :) In particular it isn't rocket science to know that a SMALLER capacitor (not a larger one) will raise the tweeter X/O frequency.
Tweeter substitution is a piece of cake compared with woofers, because enclosure considerations are minimal. (Spacing for phase reasons is about it). Just make sure that the new tweeter can go as low as the old one unless you change the X/O. Dispersion characteristics may change..better or worse is your opinion.
The suggestion by Subaruguru that modification of the X/O without replacing drivers might satisfy your needs is reasonable. However, bear in mind that someone else already "optimized" the crossover for these drivers. You might try substitution of same-value better-quality inductors and capacitors in the X/O. This ain't cheap. Again, do one speaker at a time so that you can evaluate the results.
Tweeter substitution is a piece of cake compared with woofers, because enclosure considerations are minimal. (Spacing for phase reasons is about it). Just make sure that the new tweeter can go as low as the old one unless you change the X/O. Dispersion characteristics may change..better or worse is your opinion.
The suggestion by Subaruguru that modification of the X/O without replacing drivers might satisfy your needs is reasonable. However, bear in mind that someone else already "optimized" the crossover for these drivers. You might try substitution of same-value better-quality inductors and capacitors in the X/O. This ain't cheap. Again, do one speaker at a time so that you can evaluate the results.