My apologies if this question has been asked before.

I recently upgraded my Sierra 1 speakers to the Sierra-2EX. As expected, the improvement in the mids is substantial.

Now I’ve been looking at the Sierra Tower speakers. These contain a better ribbon speaker than the Sierra-2EXs. But the mids appear to be the same as those found in the Sierra 1. Why don’t they use the better performing mids from the 2EX? Are there any plans to upgrade the towers to use the 2EX mids?