Usually containing the bass in the room is the opposite of what you want, unless you're concerned about disturbing the neighbors. The reason for this is that it reflects around inside the room which acts like an organ pipe, giving you peaks and dips at various frequencies. So while keeping the bass in the room will increase bass levels at some frequencies, it will decrease it at others and give you time smear, pitch shift, and one-note bass.
So I'd look for other solutions, which could include new speakers, subs, or a bit of EQ (so as not to overdrive the woofers or amp). Also, if your room is too live, you adding some mid/hi frequency room treatment might improve balance by bringing those frequencies down some.