Yes. You can connect them how you like into subs then tops or tops then subs. Each speaker sorts out its own requirements. Not so useful when mixing different makes which don't do that!
Steve.
I mentioned this because the OP was talking about RCF tops with K-subs and I didn't want him to think he could rely on an HP filter in the sub using this set up.
There have been many comments online in various forums that contradict each other - this was the main reason I reached out to QSC directly about this.