Should i changes my sub to Fathom f112 or f113

I haven't heard the supernova sub but I have the same sonus faber setup powered by a pioneer elite 94txh and I use a f113 sub. The sub blends really well with the S.F.'s and is louder, lower, and cleaner than any other sub I've had(velodyne hgs15, revel b15, mirage bps12 I think?) anyways its a great sub. I'd guess it be better but without hearing your sub, who knows.

Just know that, even if you do find what you believe to be the best subwoofer you can get, that the main issue - considering you buy a good woofer, with fundamental good performance to fit your room/system - is going to be how well you can set it up, get flat response, good phase between sub/speakers, etc, yes!
I've yet to hear even a $10,000 Wilson subwoofer DESTROY another subwoofer in performance, simply because it was possibly potentially better than another, as a factor alone.
Actually, I've sold some of the best subwoofers on the consumer market. And the single most important factor still remains setup.
I've heard the most expensive subs in the world sound aweful, without careful setup relative to the room and the rest of the system. I've also heard modest subs sound simply stellar in the right setup.
good luck

Doggg..looking forward to get F113sub?

Iplaynaked..will keep in mind for the proper set is the key...

For the record, I've some experience with the Supernova MKIV 15" sub. They are indeed excellent all around sub's, with plenty of output! I haven't run into a situation where I could bottom one out on their own, personally. As for music, not bad either!- and they blend very well.
All of this considering proper setup and tweaking, as usual.
Basically, I've gotten plenty good results with it.
Now, I would give the nod to something like the Paradigm Servo 15 for musical accuracy and speed. Infact, for $1500, I never have heard any sub that out-matches the Servo 15 for HT/music dubties for the money. Simply superb subwoofer, and a killer bargain!
However I've never heard a single subwoofer that I thought, on it's own, was the end-all-be-all of subs though. So, for the record, for the price of a single JL Fathom F113, you could buy TWO PARADIGM SERVO 15'S and have more dynamic headroom (two 15" subs of this caliber would allow you to run each sub with more efficiency, and less taxing on each), less distortion possible (properly placed, dual subs will cancel out any distortion differences between them, so you only hear their similarities), and simply more brute output than one single JL Sub! Of That, I garantee!!!
Plus you can run "stereo sub woofers" with two Servo's.
Of course, you wont' have that shiny black lacquer finish, then - lol
Just some thoughts. But, you can always pick up a JL and compare, and then you'll know