I have a 5.0 system with 4 CBM-170SE's and one CMT340SE center. My usage is 50/50 TV/Netflix and music. With a subwoofer my expectation is that the CBM's and CMT will sound better and I will hear more defined bass. I'm not into experiencing room shaking special effects. My room is 13'x20' with 8' ceilings. The listening/TV viewing area is about half the room. I would probably benefit from 2 subwoofers but only one is in the budget. Probably will never justify the expense of a second one. What can I realistically expect adding a subwoofer?