The "Bose L1" is a range of portable line array loudspeaker systems for musicians. The L1 was introduced in 2003 with models that have been retroactively known as the "L1 Classic" range. These products were replaced by the "L1 Model I" and "L1 Model II" in 2007. A smaller and lighter "L1 Compact" model was introduced April 2009. The L1 Model I was replaced by the "L1 Model 1S" in 2012, and the "B1 Bass Module" was replaced by the larger "B2 Bass Module".