The DSI-2008 dual digital hybrid interfaces two (2) 2-wire intercom lines to two (2) 4-wire lines, and also interfaces balanced and unbalanced 2-wire lines. The DSI-2008 is ideal for systems with varying loads. (Amount of user stations often vary for different configurations.) Unlike earlier analog hybrids, the DSI-2008 features advanced DSP (Digital Signal Processing) to achieve automatic nulling of the 2-wire lines. In addition, each hybrid features convenient peak-reading level meters to quickly match the levels between the lines that are being interfaced. The result is easy and accurate setup. With the DSI-2008, all need for test tones; nulling adjustments and ducking adjustments have been eliminated. In addition, there is a call light option board available for compatibility with RTS 2-wire intercom and RTS Audiocom systems.