mono blocks with a powered sub?

I recently purchased a pair of Paradigm Studio 40v4's. I also incorporated a SVS PB12 NSD powered subwoofer. My pre amp is a Carver ct7 with only one set of pre outs. I have ran my pre-outs to the sub, and from the sub to my Carver TFM 24. I plan on upgrading both pre and amp in the near future.I know there's a way, but I'm not sure how to hook up mono blocks while incorporating the sub. Will a pre-amp with 2 pre-out jacks solve this problem.

Also, a public thanks to member Bob reynolds for all his advice, it's helped me quite a bit.