To answer your question, I think you'd just need to get an RCA splitter and connect the subs to the subwoofer output on the TV.
I'd suggest using a single subwoofer such as a Martin Logan Dynamo 700 or 1000. Using two JL Audio subwoofers is like putting race car tires on a Geo Metro.
There's no way that the TV has sound quality anywhere close to what a JL Audio subwoofer is capable of. JL Audio and TV sound are orders of magnitude different.
I'd suggest using a single subwoofer such as a Martin Logan Dynamo 700 or 1000. Using two JL Audio subwoofers is like putting race car tires on a Geo Metro.
There's no way that the TV has sound quality anywhere close to what a JL Audio subwoofer is capable of. JL Audio and TV sound are orders of magnitude different.