Just purchased the arc for infront of our TV that is in a high ceiling living room. I want something behind the couch; however the open floor plan/kitchen will limit me to ERA 100s. There are however two inwall old speakers above the couch and I just saw the amp and inwall set up. Can I combine the amp and arc? Will that give a good surround sound? plan for the subwoofer down the line at some point as well.