I'm a wiring my new radio the right way?

[wawa]

Hello All
I have a 2000 Boxster S with the front amp, 2 dash speakers and 2 door speakers. So originaly, no wire on the Brown B connector. Only the yellow C connector. From my understanding, the door speaker (label rear on the yellow C connector) are in fact some kind of subwoofer. Later I had the rear shelf speaker using the B connector rear pinout.

My qestion is, does the rear pin out of B connector the same signal as the rear pin out of C connector. The only difference being that the C connector send the signal to the amp to boost it?

How should I wire my new system. take the radio signal of front and rear speaker to connector C to be amplified. And connect the radio subwoofer signal to the door speaker (kind of subwoofer)

thanks
Chris