The H-4ADHD-XXX-IPLL modulator family from Thor broadcast is designed to handle even more applications than any other 4 channel chassis system that has come before. This system has all the previous features found in Thor Broadcast modulators, as well as several new additional functions for added applications and flexibility. The platform provides 5 full RF carrier outputs for generating channels from content ingested through the ASI input. Encoding in either MPEG-2 or H.264 is provided for 4 crystal clear video streams up to 1080p60 each. Bitrate is fully adjustable from 1.5 - 19Mbps, and a variety of audio codecs are available. Standard audio encoding in MPEG-2 AAC and MPEG-4 AAC are provided, as well as a licensed Dolby AC/3 audio codec. Audio sources can be selected from either embedded HDMI or analog RCA ports. For Surround sound, digital audio inputs can be set to "pass through" mode to preserve 5.1 and 7.1 audio that is encoded already in Dolby compatible format. Two mirrored ASI outputs are provided for broadcasters for added flexible in distributing the content generated by the 4 encoders.