Mine subs are 600 watt max, 300 watt rms each,12's, and there are 2 of them.

And the PSU will, psu's are generally underated just as much if not more than amps are.

idk man i doubt it.
How do i try it out?
i dont have a receiver, just a sony surround system.

Does it use RCA's to go to a powered sub?

dont think so.
its got rca but no sub out.

What kind of output does it have for the subs? Just plain speaker wire?

my bad it does have 1 sub out
but its only one black rca.
shouldnt i need 2? to come from the amp?

Nope, those powered subs that go with those are mono channel, but you need a amp with rca outputs or an rca splitter if you plan on running left and right channels out of the amp. If it has rca outputs just get another rca cable, take it from which ever side the rca input is in, and make that output the opposite input.

http://www.rockfordfosgate.com/products/product_details.asp?item_id=112089 that's my amp

My subs are 2x 12" Pioneer W-TS1200C Pioneer Bullets 800W MAX 200W Nominal

the thing that's confusing me is where to hook up the ground and positive and remote wires on the psu...
and the one rca sub out on the stereo cuz there's left and right on the amp i would need a connector wouldn't i?

Ok, imma take a few minutes and type out all of this lol

lol thanks man.
I'm not a total newb to car audio.
I know how to hook it up in a car, its just the dc-ac conversion thats fuckin me up