Will these subwoofer be enough ?

It really depends on what you are trying to do. If you are trying to accurately reproduce music. Then the subs you are looking at will do that. If you are looking to pressurize the room and overemphasize the lower bass, then larger subwoofers may be required. 

When I visit folks systems the first thing I typically notice is that the cross overs to the subs is too high and they are way too  loud, creating a huge bump in the bass... instead of an even transition and flat response. If you turn the subs up too loud, they will scramble the imaging. It's about what you are trying to do. I used to have two subs... they ran at less than 10% power and crossover of something like 40 hz. They extended the soundstage nicely. But it was so easy to turn them up too loud. 

@ghdprentice

I used to have two subs

Just interested in what you have now and why you changed?

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