Zoghead:Will it make a difference in the sound?
As you've read above, most anything will make difference in the sound. Having owned some "extreme slope" networks when I had my Khorns, I think the hard question you need to answer is about your listening habits.
I've come to understand (and I realize I might understand it wrong) that if you do lower level listening and/or perhaps closer proximity listening to your speaker, you might want to look into lower order networks.
On the other hand, if you are a more crank it up type or sit further away from your speaker (I think loudness is the higher consideration here) then you might want to consider higher order networks, more like the extreme slopes.
When I had my Khorns, one thing I discovered was I had to be about 30' away from them before the sound from each driver blended into a coherent singular "bubble" (to use Roy's word). They sounded distinctly better when I was standing further away and I think I realized that it took that long for each driver to blend into a single wall of sound.
I'd bet lunch that if I had "A" or "AA" type networks in them that the sound would have blended together at a closer distance HOWEVER, when I cranked them up I think the lower order networks might have congested the sound more than the steeper networks since they isolate each driver better than the lower order. (this is not to say that they wouldn't still sound good)
In other words, you can teeter-totter the sound a bit, depending on what networks you use and you should (IMHO) teeter the sound towards your listening goal and match the network to that goal.
Again, I don't know that I understand it THAT well, this is just my take on being a network dummy and trying to put pieces of the puzzle together that the guys above say and mate that with my own experience.
If I've butchered something, I'm sure someone will squash me like a bug 