I have owned both models and noticed mostley that the bass was a little more "loose" with the 2ci than with the 2ce. The 2ci's are also bolted upon stands. The 2ci's are also a very warm and lush sounding speaker, more so than the 2ce's.
You can check and see if the 2ce's have the more modern tweeter by taking a light and shinning it through the grill cover. The more modern tweeter on the CE was a metal dome if memory serves me right.
You can check and see if the 2ce's have the more modern tweeter by taking a light and shinning it through the grill cover. The more modern tweeter on the CE was a metal dome if memory serves me right.