free103point9's Radio 4x4 is an installation and live performance by four performers and audience members. Four simultaneous audio performances are separately transmitted through FM transmitters to radios positioned throughout a performance space. Each radio receives only one of the signals, so that the audience becomes an active collaborator in the performance, "mixing" the audio feeds by moving about the space among the four signals. The artists perform both individually on independent radio frequencies, and collectively. Previous free103point9 Radio 4x4 performances have been held at at the Walker Art Center, Art in General, P.S. 122, and the Gwangju Biennale in South Korea. Support for this project is provided by CEC ArtsLink.