JL Posted Specs...
Fathom f112:
Freq. Response (anechoic): 21 Hz – 119 Hz (± 1.5 dB)
–3 dB at 19 Hz / 150 Hz
–10 dB at 17 Hz / 167 Hz
Fathom f113:
Freq. Response (anechoic): 20 Hz – 86 Hz (± 1.5 dB)
–3 dB at 18 Hz / 127 Hz
–10 dB at 16 Hz / 154 Hz
The Fathom subs from JL Audio have been stated to have reworked drivers, and are engineered slightly different from the normal car audio drivers 12W7, and 13W7.... The F112s have better upper bass response, while the F113's provide better extension in the lower bass area..
Regardless, I would love to have sealed 4 - 13W7 in my HT... just to see how they sounded... or like RMK, 2 - 12W7's and 2-13W7's to flatten out the FR.
That would certainly be interesting...