Has anyone added a small subwoofer to 2 channel and been thrilled with the result?


The subwoofer can of worms.
I’d like to add some bass to my otherwise fine 2 speaker setup and have limited space so perhaps a single 10in?
After a few weeks of research the only conclusion I can come up with is - everyone agrees they have to be setup properly. Every brand and technology has their own following and most recommend using 2 (which I don’t want due to space concerns). My room is 12 x 13 ft with box raised ceiling.
After much research, these are the subwoofers I’m trying to pick from, for various reasons:
Rythmik FM8  - lots of hifi fans
JL audio e110 - fantastic support
REL T/9i - sort of a gold standard
KEF R400b - interesting technology, makes me grin. 

I've never heard any of these.
System:
Hegel H160
SF Concerto speakers on stands.
Ben
casteeb
Oh yes ! I love me a good two way. When done right nothing images as well. I also love subs. That being said I have only heard a few that are done right. A sub should Never be noticed but rather bring a presence and fullness, Kind of like a good flavored cream does not hide the coffee taste it just adds to the pleasure !

 I am currently running in my second system, a rebuilt set of Watt 3.1 heads with a smaller Velodyne DSD 8 sub . Its magic. Its not subbish but rather Wooferish filling in,

 I have a dual 12 GR Research(Rythmik ) that is as musical as a sub should be, Its Danny Ritchies woofers that are paper vrs aluminum. I owned the 15 Rythmik and found it a but slower.
Sub woofers, Yes one per channel if you have the room, set up is the most important part, crossover and volume set so they blend in with your mains.I am not a bass freak but subs give you the complete sound your hearing for.
Sub woofers, Yes one per channel if you have the room, set up is the most important part, crossover and volume set so they blend in with your mains.I am not a bass freak but subs give you the complete sound your hearing for.
Yes, REL sounds the most musical to me due to their unique high level connection.  It is the best way for your the sub to track exactly what your mains are putting out.  Very articulate!
I added a single centered Martin Logan Grotto (10in sealed) sub to my 2 channel setup.   Integrates really well with my Rega RS1 speakers in a 10.5x20ft room.  No localization, no nodes, no bloat, even response, and quick dynamics. Blends seamlessly to my ears.   Rolls off below 30hz but I’m very happy.  I think I have the crossover set to 65hz.  Setting level was critical as it’s easy to overdo it.   I used some test tones and an SPL meter to help dial it in.