Knot

Good morning everyone
I have a twelve speaker premium, non ML, in my 2015 RX350. I’m wanting to replace the lower front mid-bass to improve the sound quality. My research so far has brought me to the following:
- the system is powered by a Pioneer 210/ 7 channel amp.
-speakers: 1- center dash; tweeder, mid,& mid-bass in fronts; tweeder, mid- bass in rear doors; single sub in rear space.
Here’s my Questions:
- how is the signal sent to the front doors; full to all with capacitor cut-off?…from the amp to a crossover, then to each speaker?…or using the amp channels?
Has anyone made this upgrade & did you go component or coaxial?