Founded in 1994, Ultra-red are audio activists producing radio broadcasts, performances, recordings, installations and public actions, or public space occupations (PS/o). The group's work radicalizes the conventions of electro-acoustic and ambient music to explore acoustic space as enunciative of social relations.

With a fluid membership determined by collaborations between electronic musicians and grass-roots political groups, Ultra-red has developed projects around a variety of urban ambiences including needle exchange (Soundtrax, 1996), public sex (Second Nature, 1999), public housing (Structural Adjustments, 2000), issues around globalization (Value System, work in progress) and labor.

Ultra-red have released CDs and albums on Comatonse Recordings in Oakland, California and Mille Plateaux in Frankfurt, Germany.