subs for Sonus Faber Cremona M floor standing


My system includes Mac C2300, MC2102. I have it narrowed to the JL F113, Rel or SVS. I am looking to integrate it to the system... Not for the boom boom boom. This system is 2 channel for audio not home theatre. As the SF are amazing I just want to bring a little more low end back into the system. I was running Klipschorns biamped before this so I am missing the walls shaking ;)
erictye
Sonus Faber makes a Cremona Subwoofer M in their Cremona Collection.

That seems like a good place to start for system matching.
Well, just as I thought, A seemingly simple question is anything but ;) To start off, my room size is 16 x 30. My couch is right in the middle. I was considering the Rel G1 but have entertained cheaper models. That said, with what I have invested in my system it seems like a bad move to go with a cheap sub. Ultimately, I am looking for synergy with my system and not looking for the bass to be it's own entity if you will. Johnnyb53 probably makes the most logical statement the SF does make it's own sub. That said, I also know that certain products (subs especially) can be a bit of a specialized market. In the end, I am sure whichever I go with will be fine. A tremendous thanks for all thoughts... and opinions. They are always welcomed. I myself when it comes to crossover points etc. is beyond my knowledge base. Beyond this, any other chatter is welcome but thought I would drop in.
Dear Erictye: +++++ " I am looking for synergy with my system... " +++++

absolutely right and more than the whole system must be IMHO " synergy with the Cremonas " and this IMHO too means understand in precise way where is the weak area of those speakers and how improve it through subs integration.

My advise is that try to understand the IMD subject and after that decide about. No, IMHO the Cremona subs is not the best " road " even that because is a Sonus Faber product that could means synergy. Take this as a true statement is a mistake: synergy IMHO is understand the specific needs of those speakers and the subs that mate it in the best way.

Of course that you can go for the Cremona subs but nothing can tell you for sure that will be a the best match.

The subject is deeper than that especially if you care about quality performance level.

I don't care what will be your choice that care is for you but my advise has very good reasons that I can't read in any of all the other posts here, maybe because all those persons can't yet understand the real use of subs in a two channel audio home system. Again, IMHO you need to understand in precise way the whole subject.

It is not whom is right or has reason in this thread, it is to know about and that's all.

Anyway your call.

Regards and enjoy the music,
R.