On upgrading Infinity Kappa's 9.2i

I have been thinking about doing some upgrades to ma Kappa's 9.2i.
Then I looked at the crossover and had a second thought! It just seems very well made. The speaker cables also look descent.
Many other Infinity speakers have a back placed tweeter. I once had a pair of Sigma's and always liked the highs on them. I think it was because the tweeter on the back. It just filled the room in a nice way. So maybe doing the same on the Kappa's? Installing a back mounted tweeter?

Have some of you here ever done any modifications and improvements on those speakers?
 

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