One thing I really would suggest you to do is to Bi-Amp (active xover) these very fine drivers. The benefits are huge IMO and as a bonus you also get very good control over the frequency response. You might want to add a supertweeter as well (I use and love the JBL2405 as per Wayne's recommendations). I find these large compression drivers/horns very beamy in the top octave.Another awesome upgrade is a digital EQ like the (cheap but nevertheless good) Behringer DEQ2496 for fine tuning the overall fq response.
Just gotta love those 2'' JBL compression drivers!
/Magnus