Golf MK5 Speaker install

Hello. I was going to change the original speakers in my 2005 Golf MK5 to aftermarket ones, but came across some problems. I cant seem te understand how to set up wiring to new speakers. For example where to cut the wires and so on. And the biggest question why is there 3 wires going to the tweeter and mid speaker? Any help or tutorial for wiring would be nice.

You need to identify negative and positive, Bentley service manual would help. For the 3, I'm guessing one is common (-) one is mid (+) and one is tweeter (+).

I am showing tweeter 2- wires and 1+ to crossover and midrange 2+ wires and 1- to crossover. As mentioned break out the Bentley or erWin