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...