I ran my XRS hemp in my main rig along with my ACI Titan. A superb match! Actually, I unhooked my Cain BENs and put in the XRS without disconnecting the sub--and thought: damn! These XRS really have some serious bass! Then, of course, I realized that I hadn't disconnected the sub, duh! (The XRS on their own are darned good for a 4" cone.) Anyway, point is that with the Titan on my first thought wasn't "hey, I have the sub on", which I suppose speaks well to the fact that it mates nicely. So, to answer your question I'd say yes it's fast enough. Of course, no sub match is totally seamless...
But, I've found the ACI Titan to mate well with nearly any speaker I've heard it paired with. Best results for me have come when it's kept out of the corner but near a sidewall. There, it has good impact but is more like the mains in charachter and not boomy or lumpy. Oh, and I get a solid 27.5Hz response in my large volume room.
Let me know if I can be of any help.