Would an HTB-544 system be good for a 15' by 15' living room? I'm in an apartment, and the living room is open to the kitchen and dining area. My couch is in the middle of the living room, so it's about 5' away from the back wall and about 5' away from the TV. The surrounds would have to be put in the corners of the back wall, about 5' above the couch. Should these face at an angle toward the couch? Please advise. I was initially looking at separate components, but I've been hearing really good things about this system, and the price sounds really nice.