RCA/Pre-Amp Wiring Help!

[freeride53]

So I have a Blaupunkt Key west headunit, that has a pre-amp sub output, with four red/white female connectors (rr,rl,fr,fl)....
However, My RCA wiring to the headunit only has two RCA male connectors (red and white). How would you go about connecting them? I'm a complete wiring noob.

I have the amp, subs, speaker wire all already wired, as I carried it all over from my Peugeot. Now i'm just trying to run it in my e30.

[StereoInstaller1]

You have this?: http://www.crutchfield.com/p_023KEYW...ures_and_specs

[freeride53]

Yes I do, but in the manual, and on the stereo itself, it has Subwoofer controls. Idk why it says it doesn't on that fact-sheet

[StereoInstaller1]

If everything else works already, just swap them until it works.

If the deck does not match the manual, I can't help.

[freeride53]

hmm, so just try plugging the two into the four in different combos?
I'll give it a shot as soon as I sort out all the under-dash wiring that I accidentally tore yesterday. :(