Did some looking....
Specs n such
The compact Fathom f112—single 12-inch woofer / 1500 watt amplifier, (18.5”H x 15.0”W x 18.13”D) and Fathom f113—single 13.5-inch woofer / 2500 watt amplifier (19.63”H x 16.5”W x 19.75”D) also benefit from the dynamic advantages of their proprietary JL Audio woofers. Listeners can expect full bandwidth down to 22 Hz
The flagship Gotham g213, weighs in at 305 lbs., measures 34.13”H x 21.25” W x 23.75”D. This system incorporates a pair of JL Audio’s highest-technology subwoofer drivers and an amplifier that can deliver 3800 watts of short-term RMS power for outstanding dynamic capability. Twin 13.5” extreme-excursion subwoofers are incorporated in the Gotham to deliver performance to well below 20 Hz in a typical home theater application.
Features for both:
Unbalanced Inputs: Stereo or Mono (RCA jacks)
Balanced Inputs: Stereo or Mono (female XLR jacks)
Output To Slave: Balanced (male XLR jack)
Input Modes: Master or Slave
Level Modes: Reference (fixed gain) or Variable from full mute to +15dB over ref. gain
Power Modes: Off, On or Automatic Signal-Sensing
Light Modes: Off, On or Dim
Low Pass Filter Mode: Off, 12 dB per octave or 24 dB per octave
Low Pass Filter Cutoff Frequency: Variable from 30 Hz – 160 Hz
Polarity: 0 or 180 degrees
Phase: Variable from 0 – 280 degrees
E.L.F. Trim: Variable from –10 dB to +5 dB at 20 Hz
The suggested retail prices are: Gotham: $7500 (available in high gloss black only) Fathom f112: $2200 (matte black) - $2400 (gloss black) Fathom f113: $2800 (matte black) - $3000 (gloss black.)
Check out the quick writeup on AH (actually the press release from JL):
http://www.audioholics.com/cedia/cedia2004/JLAudioGothamFathomsub.php