Help in hooking up a sub woofer.

Hi, I have a PrimaLuna ProLogue integrated amp.I have a pair of PSB Synchrony 1B's which until now I have enjoyed very much.
(I have a small living room)I just bought a PSB SubSeries 150 (subwoofer) but when I got it, I knew I was in trouble.The sub has "only" RCA jacks. My Amp of course only has the speaker terminals and no other dedicated Sub  hookups.What is a bit irritating is the PSB "Owners Manual" indicated you could attach speaker wire to the sub. I then discovered they use the same manual for all their subs; possibly some of them do.Does anyone know a way to connect the amp and the sub? And would it be a method you would find acceptable or is it a horse it in job?Thanks for any and all help.