Automatic loudness controller for four stereo programs or one surround program. 5.1 OptiMix is now standard. Surround processing in- cludes a loudness-controlled and peak-controlled downmix output that can drive an analog TV transmitter. ATSC A/85 (CALM Act) and EBU R 128 compliant via third-generation CBS Loudness Controller. Includes CBS and BS.1770-2 loudness meters. Automatic dialog intelligibility control. 3G HD-SDI provides video delay to match processing delay, ensuring correct AV sync. Seamless switching of audio, video, and meta- data between loudness control and pass-through modes. Dual-redundant universal power supplies. Two rack units high.