On my crossovers, it goes WOOFER [out + -] [in + -] and TWEETER [out + -] [in + -] so there are two +'s and -'s for input from my amp. So how do you I connect those to my amp which has just the [+ -] for channel 1?

16 guage speaker wire is plenty thick enough for my components...right? Woofer runs at 50wRMS at 4 ohms, tweeter 40wRMS at 6 ohms and my amp is 65x4. I'm putting the crossovers in the trunk with the amp so I'm running two speaker wires to each door for the woofer/tweeter.

As always, TIA.