Quote Originally Posted by davef View Post
We already use a 5 1/4" midrange driver, going with a larger midrange will hurt performance, not improve performance. A larger midrange means a lower crossover point to the tweeter to avoid both beaming issues and cone resonance. We can not cross our tweeters over any lower than we already do - nor should any manufacturer - doing so dramatically increases distortion and significantly lowers power handling.

I have a suspicion as to what type of sound you are looking for, if my suspicion is correct - it really has nothing to do with driver size, more to do with a slower transient response, which creates an overall less light and airy sound. We can do this for you if you want to experiment a bit, by lowering the efficiency of your towers.
Interesting. And a bit scary if I made any change to my current towers. Let me email you off line to see what it would take.