Mamas1993 - I had actually pulled up the manual prior to my original response. You're certainly welcome to us a JL Audio subwoofer, but at least consider only using one.
Consider this, have you ever heard a 2 watt single driver speaker that sounded very good? Even the cheap stereo systems at Walmart are 20 watts per channel. Specs are not everything, but in this case I think it's a fair indicator.
I'm sure the TV, setup properly, will sound much better than other TVs, but will still be junk compared to even a moderate 5.1 system using an receiver and seperate speakers properly placed.
For perspective, I have a $1,500 Integra 50.1 receiver, $3,000 Focal 836v main speakers and I use a $700 Martin Logan Dynamo 700 subwoofer for home theater.
I've heard several of the JL Audio subwoofers, including the big Gothom, and am familiar with their quality. The bottom line is that they are way beyond even my system for home theater.
Bob also has an excellent point in the overall frequency response of the TV combined with a true subwoofer.
Ever seen a Ferrari in a trailer park?