Mono set up?

I'm looking at getting a TS215S Sub and a TS212 Active PA Speaker, a mono set up.
How would I best hook it up? I have a stereo output from my drums, but wondering if to wire it with just the one XLR cable (to channel 1) or is it best to use both L/R outputs in to the Sub then L/R to the full range cab?
Thanks in advance for any help.
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