I am about to buy a PB2-isd for my apartment and was wondering if the PB2-isd would be efficient enough for my setup. I use my setup mainly for movies and my music doesn't utilize the subwoofer that much. I currently am using a borrowed Onkyo HTIB subwoofer from a friend that has already upgraded to a PB2-Plus. I listen my movies from 75 to 85 db. My speaker setup includes: Axiom M22ti (fronts) Axiom VP100 Axiom QS4 (surrounds) Pioneer Elite VSX-05 DD 5.1 reciever The living room where I have the setup has one wall open to two small hallways and a kitchen which I've already taken account into calculating the volume of the room. The 3000 cubic feet includes the kitchen with the living room and both hallways. I don't know if this is the right way to calculate the volume but I did it just to be safe. The living room alone is about 2200 cubic feet. If any PB2-ISD owners can give me the size of their rooms, that'd be great. Any other input would also be great as well.