To celebrate two decades of Metro Area, Environ has partnered with renowned mastering engineer Matt Colton (Metropolis Studios) to remaster and recut the first four Metro Area 12"s: Metro Area, Metro Area 2, Metro Area 3 and Metro Area 4. Unlike the album reissue, these records include the original, extended 12" versions of all songs, including some which have never been re-released. Metro Area 4 is the duo's fourth 12" EP, originally released in 2001.