Are you talking about the TL606, or a different EV design?
To follow up on my original question here, I bought two Eminence Delta Pro 15As from the great guys at Midwest Speaker Repair (the best), and they're absolutely fantastic in my cab. Everything I was hoping for: plenty of efficiency, nice and full, not boomy, plenty of clarity and high end for my purposes, no gross clank in the mids. Two thumbs up.
One thing I noticed while spending way too much time on the Eminence site; their speaker response curves aren't all on the same scale. I saved the ones I was interested in and overlaid them all in Photoshop, and the choice became pretty obvious.