Hello riggstr44,
The "pass-through" jacks are outputs that allow you to send the same input to another amp.
Each set of the remaining RCA's handles a pair of channels (2 speakers).
You want a 4-channel LOC like the one shown here:
http://www.crutchfield.com/p_142SLC4/Scosche-SLC4.html?tp=2001
Connect the speaker wires from the factory receiver to the input screw terminals (marked A1 through A8) and run 2 pairs of RCA cables to the 2 sets of inputs on the 400.4.
Hope this helps.
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