i used a piggy back dealio thing that basically splices into the speaker wires coming off the amp in the trunk. it has RCA outputs that run to your sub amb.
for the power, i drilled a hole in the fire-wall (just kinda eyeballed it and prayed). worked out ok. (put a grommet around it).
attached a wire connector to the wire so that i could tap directly on the battery terminal.
for the remote power, i found a fuse that is always "on" whenever the car is on and basically attached the remote wire to one of the legs. then, i ran it under the trim and into the back of the car.
for the ground, i found a nut somewhere in the back by the amp and attached the wire to it.
but to answer your question, i don't know if there is a specific sub output.
unless your amp has a built-in crossover, you'll need one before your amp since i don't think the monsoon has one.
enjoy.
drink some red wine, too. or a homebrew.