The band has seen several changes in line-up, with Bill Leeb being the only permanent member. The first album, Grinding into Emptiness, arose from the collaboration between Leeb and Marc Verhaeghen of Belgian industrial band Klinik. It was released in 1989 through Wax Trax! and Antler-Subway. The 1990 follow-up, Response Frequency, was the last release to feature Verhaeghen until 1996 and included Rhys Fulber who would remain with the band for the next three albums. Verhaeghen resumed his collaboration with Noise Unit for the 1996 album Drill which also featured members of German industrial band Haujobb. After a eight year hiatus Leeb teamed with former Front Line Assembly member Chris Peterson in 2004 to release Voyeur in 2005. In 2014, Front Line Assembly announced on their official website that a new Noise Unit album is in the works and the line-up is the same as on Front Line Assembly album Echogenetic.