Why so many JL Audio Fathom subs for sale I wonder

Howdy Jp1208. So you ARE operating them in a Master-Slave configuration. That is interesting. Having not owned JL Audio before, I have often wondered what differences may exist if coupling one to the other as opposed to running them in stereo mode. Also, you (Jp1208) mentioned that you x-over at 80hz, and even 90hz. Personally, I have not liked the overall sound when setting any of my previous subs x-over points that high. I have generally set my x-over points at around 50hz to 60hz, and found that to be much more to my liking. I HAVE indeed run dual subs (of the same manufacturer) before. I've run 2 Velodyne FSR 18's, 2 Von Schweikert "Towers of Power", and 2 Sunfire True Subwoofers. All at different points in time. The big Velodynes were staggering and waaaaaaaaay too much for a two channels set-up. The Sunfires were friggin' terrible...I'm talking real hammered dog shit (only MY opinion), Muddy. Overblown. Distorted. Inaccurate. Shook the whole house but could never get them to integrate worth a darn. I dumped them quickly. The Von Schweikerts were probably the best overall pair of subs I ran in conjunction with a pair of Martin Logan Quest Z's. I'm still kicking myself for having gotten rid of them. Oh well, live and learn, huh? I always ran the pairs of subs in stereo, sending the left and right signals from my preamps, to each of the subs, respectively . Never used any sort of processor. Now here I am in 2013...15 different subwoofers later, and now it's time to try JL Audio. I suspect a pair of F113's might be a bit too much given my room dimensions?? But I'm leaning toward a single F212. Maybe? Haven't yet decided. My JM Lab / Focal Sub Utopia is really an awesome sub, but seems to be "out-paced", and "out-gunned" when used in conjunction with MBL 101e Mk2's. I loved what the JM Lab sub did while doing duty with my Martin Logan Quest Z's, but not so much with my MBL's.
Hence, my renewed "quest" for bigger, badder, more ferocious bass.
That having been said- any last bits of input from you fellow Audiogon members regarding which direction you might take things?
1 Fathom F212?, or 2 Fathom F113's in a master-slave configuration? (again, my room is 15'w. x 18'd. with 9 foot ceilings).
Thanks to all who have contributed input so far.

I'm getting two F113's next month. My room is 21x18x10, and I'm a big trance/electronic listener. Hoping they measure up to all the great reviews!

Hello Coloneltushfinger. Right on! Our listening rooms are very close to the same size. Get back to me, and this thread once you've got them set up and dialed in. Be interested to read what your experience is once you've lived with them for a bit. Still have not yet got those JL Audio subs myself, but your input will be welcomed and much appreciated. Rock on brother!

Jl audio subs may be more common on the market due to their well deserved popularity and the unfortunate downturn in the economy

Subs are the "extraneous" component and can be downsized at less expense

I have one F113 that drives my ht to great levels

I also have a 13 in sub in my car and two pair of door speakers

Great stuff

Best sub I have ever heard. I can imagine because people realize the spent a house payment on a sub is the reason they want to sell it.