Rockford P4004 amp options

I am thinking about getting a Rockford Fosgate P4004 to power 2 speakers and a single sub. The specs on the amp are:

How would I wire this to two Infinity Kappas rated at 100 RMS and a sub (don't have the sub yet). My main question is how would I wire the sub up to it...I suppose it would bridge two of the channels into one and then use the other two channels to power the Kappas? What impedance would I need the sub to be and how much power would that present to the sub in bridged mode?

nice amp; I actually just recently got one of these to power my kappa 52.5i's and 62.5's and am loving it.

Anyways, as for the sub, it will need to be a single voice coil 4-ohm model, or a DVC sub with 2-ohm voice coils wired in series.  This is because this amp cannot run a bridged load of less than 4 ohms.  As long as you're bridging two of the amp's channels, the sub will get 200 watts RMS.