There is no such thing as “fast bass” it’s usually “no bass” room and sub go together in a way that you can’t separate them so listening to a sub is actually hard to do and eq is always necessary then you have “fast bass” when the droning room modes are somewhat mitigated

subs that go really deep can provoke more room problems and appear “slow” but it’s usually the room .
SVS has a processing delay due to its functions ( PEQ etc ) your bass managing possibly need to accommodate that .
It’s quite possible to fail at setting up these .
That said I I've ordered two KC92 when the logical choice would have been two closed arendahl

I wanted closed box subs for the application .
I have the KEF LS60 active speakers and wanted to use their internal bass management who is somewhat lacking , but it worked fine with KEF’s own subs ( with ready made presets ) and I could try in the store with one KF92. I don’t think any sub with processing delay are always ok with LS60’s own integration you have to try first and arendahl is an ID brand ( hassle to return )
The plan is to use PEQ in my WiiM streamer to fix the final niggles ( if that does not work I’ll order an Mini DSP and try that ).
I’ve got a package deal with the speakers and the dual subs together
these are simply to expensive otherwise.
the size works with my placement options for two of them ( my previous rhythmic FV15HP could only be in one corner and nowhere else ).
This is a music only system . The KC92 would not cut it as a HT sub not even two ? It will work in my medium sized room for music with my typical listening levels.
I really like the look with the charcoal black LS60 and Piano black KC92 and the rest of the room decor .
Subs usually looks horrible and can be showed into a corner in your HT room but not much else .
It does not have to make sense

I simply liked those KC92 .
If I ordered passive speakers I go with dual arendahl and mini DSP SHD . ( but I liked the LS60 to much ).
I’ll eat my words when the subs arrive, maybe it does not work ?