I've never owned a sub woofer and lately it occurs to me that I might be missing out on something. In stereo, sub woofer systems I've listened to give me the distinct impression that the bass is coming from the sub woofer and it doesn't feel integrated with the music coming out of the mains. And so I've avoided them. I'm willing to believe that that won't be so much of a problem for me in the context of a home theater.

I set up a home theater a few years back and never got around to attaching a sub woofer. It is probably time. I have a Sony surround receiver about 100W/ch and Infinity Entra Ones in the front and Infinity Primus PC250BK for the center, Minimus 7's for the surround. I've told the receiver I have large speakers in the front so I get a fair amount of bass and plenty of loudness from the system.

How much will adding a sub woofer improve things? Any advice on placement and what to buy? What should I tell my kids when the rumbling keeps them up at night?