Will these subwoofer be enough ?

I upgraded my speakers from Sonus Faber Olympica 3 to Sonus Faber Amati Traditional. I felt I no longer needed them. The perfect coherence top to bottom, make me very happy with the sound. 

I was a planar speaker person for a couple decades. Subwoofers always part of the solution. I had heard that dynamic floor standing speakers could have excellent coherence... the same character from top to bottom. I never knew what is was until I got these speakers... I instantly understood. Extending the bass and trying to feather in different sets of speakers to boost the 28hz to 20hz range did more damage than good. 

I don’t listen to hiphop and don’t try to rattle the house. I listen to rock, jazz, world, classical and electronic. 

In my experience 2 subs sounded much better than one in the 2 systems I’ve setup.  Started with just one both times.  Best to plan for 2 in my opinion. 

Thanks to everyone that responded thus far.  Some great information here.  
I am not looking for booming bass at all and about 70% of the music I play the horns have enough bass for me.   Just wanting to add a little more for certain music but must be seamless and not overbearing but make a noticeable difference if that makes any sense.  
 

thanks to everyone so far and please keep responding with your experiences / opinions. Very helpful 

@hardhattg Your second post only reinforces two REL subs exactly what you're looking for. I was looking for the exact same thing in adding subs to my Khorns. I've had conventional subs with low level connections, dsp, far more powerful bass than the REL's, they always brought attention to themselves through excessive boom or discontinuities with main speakers. With the smaller REL's running at present one wouldn't even know I'm running subs, the integration/coherence makes it sound like Khorns that simply reach lower freq than typical of Khorns. I'd actually rate the improved sound stage as a greater improvement than greater freq range. I wouldn't even call it added bass as I don't have any freq overlap between Khorns and subs. REL's preferred connection scheme via high level speaker binding post means subs flavored by amps to some extent, this adds to the coherency thing.

Anyone have any experience with these specific classic REL subs ?