I have a Kicker ZR 240 with the XMS chip in it. It states that this amp is 1 ohm stable. What ohm subs should I get to run on this amp? I am putting 2 10's under the back seat of my 2000 Ext. Cab F150. Thanks for the help.

 

That amp is safe into 1 ohm in 2 channel configuration. That means it can be used safely into a 2 ohm set-up when bridged. It will produce 240x1 into 2 ohms, so I would get two 4 ohm subs that will handle about 125 watts each RMS, and wire them in parallel. Your system won't win any SPL contests but it should be very adequate, unless you're wanting to wake the dead.