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I use two JL f110's for my stereo where they play in the background to fill in the sound. I had one f113 in my room, but for better imaging and the small roll they play in my 11x25 foot room the f110 (for the price) is all I need.
For home theater where a sub plays a larger part you need the f113 for better impact and to shake the walls.
I use two F113's. The point is not to shake the walls but to even out the frequency response in the room (always easier with two subs). I would buy one F113 now and when funds become available buy the second one later. You can run them in stereo (master/master) or as master/slave (which I do).
By the way, if the walls are shaking and you are not watching the pod scene in War of the Worlds you are running them way too hot and/or you have room mode issues to fix.
I have 2 x f113 in an identically sized room. Walls are not shacking at all. Just clean tight bass. Get one f113 first, and when funds permit get a second and run as discrete stereo pair. Always nice to know there is an upgrade path down the road. Getting 2 x f110, be done with it and always wonder what 2 x f113 would have been like is plain audiophile torture IMO.
I have one JL-F113 and an extremely satisfied with both music and movies. My Arcam FMJ-888 has a built in eq and speaker set up. After running this I no longer have the walls shaking but excellent balanced low end. I did do some tweaking to the sub. I had Bright Star Audio create a stand about 12" high that I filled with sand. That alone made the sub more musical IMHO. I then upgraded to a Synergistic Research Subwoofer 2 XLR Cable. OMG that cable mellowed out the boom and now I am extremely happy with my investment and choice. One is enough if you assist it just a little. My two cents.
Tried the f110(not enough) and the f112 (enough). Friend had a Velodyne Optimum 12 and brought it over. A/B'd the two and the Velodyne actually sounded tighter and more powerfull. Have since returned f112 and purchased Optimum 12. Saved almost $2,000. I strongly suggest you find a shop that will let you demo numerous subwoofers before purchase. All rooms have different acoustics. JL is very good but in my belief it is overpriced.
Just purchased a f113 and have been listening over the last 24 hrs so still adjusting but at this point I can say it is very, very, very quick, accurate, muscular only when called for plus it has a sense of effortlessness in power (so that's what 2500 watts of power does!). I'm not into home theater but I had the pleasure of visiting Dr Bill Gaw last week who has 2 of these subs in his room and when we watch the gladiator scene of GLADIATOR my palms actually were sweating! It was a wow experience. The JL Audio f113 has put my 2 REL Stentors to bed, may they rest in peace (and for the love of me why couldn't REL have placed all controls on the front of the box!).