I really love my Phoenix Gold. They are relatively inexpensive and have great sound. When i went in to the sound shop and the owner say my Phoenix Gold he started raving about how under appreciated amp company it is. Try this one out, it's pretty powerful, but those speakers look like they could handle it (I am too lazy to check your Kappa's specs).

http://cgi.ebay.com/Phoenix-Gold-XEN...QQcmdZViewItem

 

Assuming no amp change, I wonder what the difference in these speaks and the factory with Audiophile would be? Given that the Audiophile have a separate tweeter and the non-audiophile does not, that may be a lot of the difference. Anyone with Audiophile changed just speakers? I am not complaining, the audiophile is the best sounding stock system I have ever heard....and I have changed out the factory system on almost every vehicle I have owned.