This is a drop in replacement for any of the standard M&K Woofers used in their Sub Woofer Designs 4 Ohm version.
Mavin's Own 12" High Performance Driver
Rated to 250 Watts RMS with a Minimum SPL of 90 dB
It has a Practical Frequency Range from 25 Hz to 5,250 Hz
Rubber Surround and Heavy Magnet Structure High End Quality at a Mid Level Price.
Simply put, remove the screws from your M&K Sub, unhook a few wires, then just swap out the woofer doing the reverse to install the new driver.
5 minutes and you're done, better still your M&K Sub will sound like new again. At 15 pounds this driver is more efficient than the M&K's meaning that your sub may hit just a little bit harder.

Features
 

• Stiff Pressed Paper Cone with Rubber Surround
• 250 Watts RMS Power Rating
• 4 ohm impedance
• A Practical Frequency Range from 30 Hz. to 3800 Hz.
• 2 inch ( 50 mm ) Voice Coil
• Size 12 3/16" Dia. for a 11 3/16" mounting hole, and a 5 3/8" mounting depth. 8 mounting screws
• Note that you can also get this speaker in an 16 Ohm Impedance
• Although generally a drop in replacement, there was a time when 12" woofers tried to go metric, I advise measuring your old driver to see how it stacks up against this Mavin woofer just to ensure fitment.

Thiele Small Specifications

• • Revc = 3.600 ohms
  • Fo = 35 Hz.
  • Sd = 53.093 mM
  • Md = 60.000 g
  • Bl = 7.547T
  • Qms = 2.379
  • Qes = 0.906
  • Qts = 0.656
  • No = 0.549%
  • SPL = 90 dB
  • Vas = 130.532 mM
  • Cms = 326.102u M/N
  • Krm = 5.108 m Ohm
  • Erm = 0.728
  • Mms = 67.034 g
  • Mmd = 60.000 g
  • Kxm = 28.394 mH
• Exm = 0.577