I recently purchased a pair of Paradigm Studio 40 v.2's. I like the sound when I listen to music in 2 channel. When I watch movies I think there is some low end missing. I am now in the market for a sub and would like to know what to look for. My room is 15'x18' with 12' ceilings. I have a Studio CC and SA-30R for the surrounds. Thanks in advance for the help.