Intellifocus auto digital convergence is a menu-accessible feature that automatically optimizes convergence for the sharpest picture possible. The D52W20's 3D Y/C digital frame comb filter further enhances resolution by removing blurred edges between colors and reducing dot crawl (tiny, moving dots of color along a sharp color separation in a vertical line). A dedicated subwoofer output lets you hook up a powered subwoofer (no audio/video receiver required) to beef up the low-end for home-theater thumping. Virtual Dolby simulates surround sound from the set's stereo speakers.