Colleen, welcome. You indicate that you're a little confused and uncertain about calibrating a sub, but don't indicate specifically what's concerning you. Calibrating basically just involves setting the sub level control so that the sub level is about equal to the level of the M60s and isn't so loud that it draws attention to itself as a separate sound source. Lots of people simply do this by ear, although that often results in the sub being set too high because they want to "hear" what they paid for. Better is to use a meter, such as the one from RadioShack, to balance the sound. This isn't terribly complicated and I don't really think that the setup procedure should dictate what you buy.
