Typical soundbars come in two forms. One is simply the bar by itself, nothing else. The other form is a soundbar plus a subwoofer. Subwoofers are, usually, black boxes that provide extra bass; speakers, unlike many gadgets, actually have to take up physical space in order for their diaphragms to vibrate. To get great bass performance, you need a larger space than can fit in a soundbar, so some soundbar systems will include a subwoofer. Though this box can go anywhere, the best place is on the floor near where you usually sit. You won’t see it, but you’ll hear it.