Wiring confusion with JL sub and components

I'm hoping some of you can offer more help than I've been getting from JL Audio. I've had one of their wonderful Fathom 113 subwoofer for a few years now and don't believe I've ever had it correctly connected to my designated 2-channel system.
I have an older Jolida 801 integrated tube amp which, because I am running a Jolida JD9 phono preamp, new SACD player (just scored on one of the new Marantz SA 11s'), along with a tuner, doesn't have any remaining RCA connections to be able to connect the JL sub to my Tape connection (have seen this as being one of the suggested methods of connecting). I had purchased this power source used around 6 yrs ago. The previous owner had an additional set of RCA connectors installed for running some sort of sub within his system. I've come to find out that these 2 connectors won't work with my JL Sub, so this is why I'm posting a question out to you folks.
Other than purchasing a new amp/preamp setup or running this sub off of my "normal" speaker "outs" is there a better way to connect the Fathom to my Jolida? I'm starting to see where I'm pushing myself beyond the usable parameters this Jolida offers, but can't afford to chew off 8grand until next year. Would like to see what correct methods of integrating the system together might be. The Jolida does have both 4 and 8 ohm speaker connectors on the rear. Not sure if these connectors would be worthwhile or not.
By the way, my main speakers are Klipsch La Scala IIIs which, in a larger room really need the extra "punch" a good sub can offer. Will send out my thanks in advance. I know this topic has been covered over and over again.