10k is what they do in the big monitors and I must say it works fine. Might take a look at the 4355 posts in the forums. 8" ... well my personal experience is, (not scientiffic) that somehow a small unit between the 15 and the 2" driver/horn combo sounds like something is missing, although I have no clue what happens if you use a 1" driver with adapter behind it. Maybe try first to run the 15" to the horn and see how that sounds, to get an Idea. (might be a BIT colored
) but the dynamics should be there.