Yes. Don’t think about getting a home theater system without a subwoofer. Subwoofers provide the low frequency bass that creates the rumbles of the jet engine in Iron Man or freeway bridges collapsing in Die Hard 4. THX recommends getting the biggest subwoofer that your living space and budget will allow. In the world of THX Certified speaker systems, a 12-inch or 2×10-inch subwoofers is a minimum requirement.