You can set it up with the 1014 the same way you have it now.
If you choose the pre out option instead, either get a sub cable that has one RCA input and two RCA outputs, or use a cable with one RCA connector on each end, and plug it in the left input on the sub.
If you choose the pre out option instead, either get a sub cable that has one RCA input and two RCA outputs, or use a cable with one RCA connector on each end, and plug it in the left input on the sub.