Musical subwoofer under $2000

In my opinion if you are not listening to loud bass driven rock of some type, the addition of a subwoofer to a full range speaker will not make a big enough impact to justify the expense.
 

I couldn’t disagree with this opinion more.  This is the statement from someone who has no idea what subwoofers are capable of.  
 

I also feel the low end will give me more presence and atmosphere.

I TOTALLY AGREE with this statement and what was totally missed by the prior response.  Subs add so much more than just more bass, and anyone who doesn’t realize that is just subwoofer ignorant.  There’s a reason Wilson uses subs with their Alexandrias and Magico uses them with their Q7s and up, and I think you obviously get that.

The Rythmic IMO and IME is not a great rock sub. Does not hit hard…….. at all. I would take one JL over 2 Rythmics all day. My Fathom F113 is on its ways back from repair. JL and I’m sure a lot of other subs are visceral, the Rythmic is not. The JL has articulation which is what makes a great rock sub IMO. Amp weighs 30+ lbs and is class d with some big ole caps. 

A pair of SVS SB-3000s would be my choice, sweet spot in their lineup, small enough to not dominate visually, and go very deep and loud, the icing on the cake is the remote adjustability via the app, priceless!

I just acquired a pair of new Rythmik F15HP2 Subwoofers.   I’ve only had them a day.   Paired them with my Totem Element Metal V2, which I think share some pleasant similarities with your Sonus Faber.

I am very pleased with the various tools on the subs to accommodate dialing in the paring with my speakers.   These subs are fast, detailed, articulate, and blend perfectly.   They go down to 14Hz and will play very quietly as well as deafeningly loud.   You might start with one sub, then add a second later, or go with two of the 12” subs now.   Either route will be within or close to your stated price range.

And don’t forget to just enjoy the music along the way.

Take a look at HSU Research ULS-15 MK2 Dual Drive. I’ve had HSU subs in one iteration or another for 25 yrs and have never felt like I needed “better”. However, if you need variable phase control look elsewhere.