Connecting sub to Yamaha CA 810

Appreciate some guidance on what is probably a simple question.

I am considering connecting the 810 to a Paradigm cinema sub that has only line in (L+R). As the amp does not have sub out option would it be best to run an extra set of speaker wire to the sub from speaker outs (ie have 2 sets of wire in Speaker A left, and 2 in Speaker A right, one set of wire running to the speaker and one to the amp)?

Thanks in advance for any help!