Best way to combine Sub and floor speakers?

I have a pair of Audio Physics Tempo III and later aquired a Rel Q201E Powered Sub. I have them both hooked up to a Yamaha low end amp and it's more for movies at this point.

The grand plan comes to fruition next week.
I am moving the Tempo's to the basement (larger room) and connecting to an Aragon 8008ST combined with the Aragon's 18K Preamp.

What is the best way to connect that sub to the Aragon amp?
A) Get a preamp with Sub output (RCA output)?
B) Don't even bother?
C) Per instructions - there are 3 leads - a negative wire which goes to one of the negative speaker outputs, two positive leads, one to each L and R of the speaker outputs.
Will this work with the Aragon 8008ST?
Will the "C" option effect the performance of the Tempos?

Thanks!