I have been doing a lot of research to build a 5.1 surround sound system for my house. My living room is 20’ by 26’. First, as a result of all the great things I have read about the Epik Empire sub, I have gotten my heart set on incorporating it into my system. I then narrowed my search down to Def Tech’s BP8040ST 5.1 system. The BP-8040ST’s already has a sub built into them and I have read many reviews where people have stated that they provide more than enough base. Does anyone have firsthand experience with this? Of course I am looking for a good amount of base but not enough that it creates a muddy effect. My though is that the Empire will add better base on the lower end that the BP's will not be able to since they are pushing 8" subs. I’m still on the fence with the BP8040ST’s because they are Bipolar and being the novice in audio that I am, I am not sure if this is the way to go. Is there a better line of speakers that I should go with so that I am not spending money on the subs build into the BP’s when I plan on incorporating the Empire into the system anyway? Please feel free to give advice on whether the BP’s are a good choice and if so should I add the Empire. Thank you.