polk audio surroundbar360 dvd home theater system black

I'm trying to hook up the Polk SurroundBar 360 directly to my receiver without the dvd system (which I don't have). Does anyone know if the SurroundBar 360 just accepts the line-level speaker signals directly out of a receiver or if it is some digital signal? So far I ohmed out the pinouts...

My Dad is currently looking at buying a Soundbar (I tried to convince him to get a regular 5.1 system, but had no luck in the end). He is pretty sold on the Polk SurroundBar 360. We stopped by a local store and it did sound pretty decent for a soundbar I guess, but we really don't have anything...