Two of JL Audio's three massive are now pumping it up: the 12" Fathom f112 and the 13.5" Fathom f113. These beasts are big, loud, claim to go down to 22 Hz, and use a room acoustic correction system that's supposed to help produce more balanced bass throughout the room. The system works much like what's found in a number of receivers these days, in which you plug a microphone into the front of the sub, and the sub automatically generates a series of tones that are analyzed by the internal circuitry to get a final optimization curve. The Fathom f112 has an internal 1500-watt amp and sells for $2600 in satin black. The 2500-watt f113 sells for $3200 in satin black. A 305-pound beast with dual 13.5" woofers that goes below 20 Hz will be available sometime next year.