I'm in the middle of installing new Diamond Audio components in my 5th gen. . .

Does anyone know what's up with the stock wiring harnesses? There's 4 wires going into them, 2 blue, 2 brown (passenger side, I haven't looked at the driver side yet). What's the polarity on them? And do I only tap into 2 of the 4 wires, or do I splice 2 & 2 into my new crossover?

Any help would be appreciated - I need to know polarity of the stock wires & which ones to cut into.