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YOU GOT MAIL
On the Monsoon, the front door and rear door speaker wires run to the rear amplifier.
The rear amplifier then feeds the sound signal to all the speakers, including the front tweeters and rear subwoofer. It appears the amp, splits the high, mid and low and supplies the separate signals to the speakers.
As for the wiring being in place, there is a good possibility that it is. On many car lines, the manufacturers have found it is less expensive to have a few connectors not being used than to have two different harnesses in the plant and for service parts.
Look in the back where the sub goes and see if there are two black 16 terminal connectors and black six pin just hanging around not connected to anything.
It also appears at each speaker there are two connectors, one for Monsoon, one for non-Monsoon.
I sent you a file with some information.