X Series Recone Kits
 
X v3 used a triple stack of 6.25" diameter magnets and a large pole vent.  Originally they came with a tall narrow surround and 7" spider pack but all are being updated to the larger surround and 8" spider pack.  This extends performance on the same platform. Includes old style dual push terminal block.
 
X v4 uses a double stack of 8.66" diameter magnets.  This is the current line of X series subwoofers starting in November of 2022.