HU's can't handle lower loads most times so don't run coaxials/components under 4ohm, especially don't if the HU doesn't have a high pass filter built in
Just because something CAN be done doesn't mean something SHOULD be done.
I personally don't run subs lower than 4 ohms but if your boat must float then whatever works to get it there.
Trick question to answer is what is powering this? Where is the power coming from? Where is more important than the internal components of your deck? NOWHERE!!!
Obviously I wouldn't run anything off the deck...EVAR..but I certainly would not try to over work my IC's to get a bit more "power".
Actually i just realized my answer was completely irrelavent, as im not running mine off the deck //content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif However it does state it can handle a 2 ohm load, but lists the same power at 2 and 4 ohm.