Yep, inside your box, you're going to only run 3 short (<1') wires:
- From the Red inside box connector to the Positive of speaker #1
- From the Black inside box connector to the Negative of speaker #2
- From the Negative of Speaker #1 to the Positive of speaker #2.
Then you will only have the 1 pair of long wires (Pos & Neg) going from wherever your amp is to the speaker box connection red and black ports (red = pos & black = neg).
If you get it working and you still don't hear the bass you want, turn up the gain on the amp at little bit at a time until you like it.