When you say "definitely needs to be upgraded," why is that? What does the current rig not do that you need it to do? I'm not sure what the rest of the system is, but if the amps/processing are long in the tooth, and the drivers are all still in good shape, those boxes would probably come back to life with some newer DSP amps and a good tuning.
It seems like there would be very few situations where more than 4 of anyone's constant curvature boxes would work well unless you need to shoot up to a balcony AND cover a front row that's only a few feet from the stage.
The 4887, like its larger family members, greatly benefited from V5.1 processing available in the ITech HD. I'd not presume to "tune" it so much as voice it.