Klipsch kg 3.5 vs. 5.2?

Anyone know what kind of an upgrade this might be? I notice the 5.2's have a different tweeter.

Get the 5.2s. I had a pair back in the day when they first came out. They use a Tractrix Horn which I think has a larger throat than the 3.5, I think! Its been so long. But anyway, I loved them as they were less bright than most other klipch, could jam and had the famous Klipsch efficiency.
They're already sold....damn.