So what is to be gained by using, lets say, a Seos-18 with a typical 1.4" compression driver versus a Seos-15 with a typical 1" compression driver? Is it simply the ability to cross the larger compression driver lower? How would this relate to better SQ? Is it safe to say that crossing a compression driver lower, assuming that the compression driver is fully capable of being crossed lower...how does that help with the overall SQ?
Now, I also understand that the larger waveguides/horns will also hold their patern lower. So the combination of having the compression driver crossover to the woofer at a lower frequency, and the compression driver + waveguide/horn also able to hold the pattern lower, why does this sound better? I mean, with conventional dome tweeters in a traditional speaker, the SQ can be massively different between different tweeters, even those that might be crossed over at the same frequency. How does this compare to compression drivers with wave guides/horns?