 Expanding on the appearance of real-time, dual FFT analyzers, Meyer Sound introduced source independent measurement (SIM) in 1984.SIM allowed sound system operators to use music itself as a test source for the first time, enabling continuous sound system correction over the course of a performance.SIM System II, the second generation of this technology (and the first version practical for widespread field use), won an R&D 100 Award (awarded for the 100 best engineering feats in any field worldwide) in 1992, in addition to the TEC award the original system received in 1986.