It is possible but totally pointless^^
Only a subwoofer + TV speakers just doesn't cut it.
Especially why a Klipsch subwoofer, I'd rather save money by adding the R-51M and the cheapest AVR. (5.2 for example)
I have connected the subwoofer to a receiver via Cinch cable. If your TV has a sub out with Cinch, then you can connect the subwoofer directly to the TV. But does that make sense without proper speakers (centre, front and rear speakers)?