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Looking at the Resonant Engineering XXX Model subwoofer, I see there are 3 diff options for Ohms. Dual 2 Ohm, Quad 2 Ohm, and Dual 1 Ohm. I'm assuming the Quad 2/Dual 1 would cost a few bucks more.

The question is, how much of a difference would there be between the quad 2 and dual 2 in regards to getting enuf power to the sub? I don't quite understand. Wouldn't the Quad 4 Ohm be harder to power properly since there's more resistance? I vaguely remember doing some Parallel and Series stuff in Physics 11/12 but I didn't really pay attention in those classes so it's really limited!

Also, if a person got the Dual 1 Ohm would a 1000 watt RMS at 2 Ohms power it well enuf?

It is all dependedn on your amp, and how many subs you plan on running.

In a single sub set up you would have these options.

dual 2 ohm XXX 1 ohm or 4 ohm

Quad 2 ohm XXX .50 ohm, 2 ohm, or 8 ohm (I am sure ther are more, but you get the idea)

dual 1 ohm XXX .50 ohm or 2 ohm

If you have an amp that puts out 1000 watts RMS at 2 ohm bridged and you want to give the XXX 1000 watts RMS you would want the Quad 2 or Dual 1 ohm versions.

If you have an amp that puts out 1000 watts rms at 4 ohms, and you still want to give the XXX a 1000 watts then the Dual 2 ohm would be the one you want.

If you are running 2 subs then you would add or divide the ohm ratings of your two subs to get the final ohm load. (depending on how you wire them)

http://www.rockfordfosgate.com/rftech/wiringwizard.asp

all that does is give you more wiring options so you can properly match an amp to the sub

Yeah basically its just more wiring options. I believe you still can order them how you want them also. I ordered mine and had them made as dual 4 ohm. I dont know if they will still offer this for the new model though? Sinister is a dealer for them he might be able to tell ya.