Sub-woofer fast enough for Horns?

Others might disagree but I find trying to integrate subs and maintain the Mid's of a 2 channel system is an impossible feat.

I disagree. I have Wavetouch Audio Grand Teton with a pair of Velodyne SPL s2 - 10". I am very satisfied. Almost all conventional speakers don't have enough resolution and presence that all frequencies (hi, mid, low) are easily washed off with the powerful subs' physical acoustic energy (like a sonic bomb). The integration of speakers and subs is easy when speakers have the realistic presence and palpable acoustic focus.

I can't imagine a HT without subs. It will be boring! The couple of subs in hi-end 2 ch system add much excitement in music.
**Warning! Many sub-woofers in HT could hurt you and (especially) young family members' ears. I recommend bass shakers under your seats and sofa.

IMO, the sub is not slow. You are hearing and feeling the prolong vibration of the room and furniture cause by subs. That's what subs are supposed to do. Without it, the sub-woofer is no fun! The problem is your speakers which doesn't have enough resolving power.

Why not use a sub bass or bass horn? Wee little cubes with over taxed transducers and poor transients are why your not getting a good match if running horns use horns.

Rythmik F15 is the fastest sub I've ever encountered.

In my experience with Lowthers, Voice of the Theaters, Klipchhorns, Acapellas, Avantgardes, and Beauhorns, no there are none fast enough.

The same is true at the other end. Only the Muratas super tweeters with nothing below 15k Hz works with horns or for that matter any speaker, and they aren't made any more.

Not sure how it works exactly but Rhythmik direct servo technology is a unique advertised feature that at a glance sounds like it should make some difference. Looks like a kind of negative feedback associated with the built in amp maybe? Not sure what makes theirs so special in that most power amps use negative feedback, but surely not all NF is created equal.