The ATI UB400B is a 4-channel interface amplifier designed to interconnect consumer grade and semi-professional equipment into professional, balanced, low impedance audio systems. The UB400B has 4 RCA inputs and 4 XLR outputs to provide a unidirectional four-channel interface that converts four IHF level signals into four balanced professional outputs.

The UB400B is particularly useful in protecting the four, eight or sixteen main or monitoring IHF outputs of low cost mixers and tape decks. The UB400B is also a very low cost way to interconnect two CD players into a balanced system.

The UB400B is a 1/3 rack width metal enclosure ready for desktop mounting and is supplied with an external 24VDC power supply. An optional 21075-501 Accessory Rack Shelf securely holds up to three units in a 1RU rack space.