Home entertainment centers may be attached to high-fidelity stereo or quadraphonic speakers. By the 2000s, the best sound systems were designed for home theater and movie sound. It typically includes more than just the left and right stereo channels. Television and VHS typically encodes extra channels onto the two main channels, while digital modes encode this information into the digital DVD source data, with center, two rear, and a subwoofer speakers. The difficulty is usually in wiring and placing the rear speakers and the necessity of buying a receiver that can decode the sound. As the size of video monitors has increased, rather than having a 20-inch TV surrounded by massive stereo equipment, it is common to have a very large flat or projection screen with a small and integrated DVD player / receiver and satellite or digital cable receiver underneath, with small remote speakers and a moderate sized subwoofer.