An entertainment center is often the largest single piece in a living room and frequently modular. Taking out the electronics, glass, and any bolt-together sections turns a wall-sized unit into a set of movable parts.
Pro tip: Photograph the full cable setup behind the TV before unplugging so your new setup takes minutes, not hours.
Watch out: Do not move an entertainment center with the TV or components still inside; they are not secured and will shift and break.