A few years ago I purchased a set of five small Cambridge Soundworks speakers. They came with a small subwoofer which the instructions told me to wire together with the front right/left speakers to provide a little extra bass. Later I purchased a subwoofer, which has its own connection to the receiver. So now I'm wondering... is that small woofer, wired in with the right/left speakers, really necessary? I'm guessing it still is, that it captures midrange sounds too high for the sub but too low for the small speakers, but I wanted to get some opinions from people who are familiar with this sort of thing.