Question on some audio "Basics"

Ok, a little confused but here is what i have and what i want.

I have a JL 12" 300 watt sub that i wish to add and a 8" JBL sub that i want to get.

... I am looking at getting a JBL amp but i'm considering some others and found a little problem in my math.

This one is the one i've been studying

This amp works good becuase it meets the qualities of my sub i own, but i wish to add another Sub. The JL's "OHM-age" is 2 Ohms, which is low And the one i wish to add is 4 Omhs. Now, if i hook these up in parallel i would get a speaker that acts as 1.33 Omhs, and the minium for this amp is 2, which is do-able and isn't good. The quickstart guide for the 301.1 has some puzzling pictures, that i can't figure out.

The first has a cable from amp to speaker and back (one complete circuit) AND a wire from the speaker to itself (looking kinda like a short circuit). The guide shows 2 speakers connected this way to its 2 outputs (2, -/+'s) and shows the speakers are 2 omhs. and the load is 2 omhs

The picture above shows the same setup without the wiring going on the other speaker terminals the subs and shows 2x "4 Omh" speakers producing a 2 omh Load.... ...2 4omhs in parallel is 2 omhs, makes sense.

If i connect the one 2 omh sub with the wire "short circuiting" itself to a set of terminals and 4 Omh on the other terminals so its just straight though, then my load is...??? 2 omhs? 3?

Why does looping the wire back through sub make the load of the system different?

Finally, if i get a 400 watt AMP, is it possible to make a setup that the JL (2 Omh) gets 300 watts while the other (4 omh) JBL gets 100 based on the impedance of the speakers? or am i losing my mind...

 

Well thanks alot, that makes sense now...

...your mind goes bonkers when you look at tech toys too! thank god...