Designed with the highest headroom available in a distribution amplifier.Handles an extremely wide range of input signals from today"s NTSC and tomorrow"s digital TV (HDTV).The DA-550 is the heart of a multiroom distribution system with outputs to eight televisions, coax runs up to 150 feet, and three inputs (one from a CATV or antenna and two from modulators.CP-DA550BID is for bidirectional interactive cable systems