Subwoofer splitter help

Hello.  So I bought a new integrated with a single RCA out subwoofer jack.  I have 2 subs that I want to hook up to it.  Both subs have left/right jacks.   How do I split the one output from the amp to the 4 inputs to the subs (one left/right each to each sub)???  If you could provide a link to such a splitter, I would greatly appreciate it.

Thanks.