 Besides the targeted market of those just getting into bass playing, they quickly became favorites of instructors who needed to plug 2 basses into one amp that didn't shake the store down, and also earned a spot as a "leave at home" practice amp with simplified tone controls for semi-pro and professionals alike.This series eventually evolved into the e-series amp and combos currently offered (2014).In 2009, the RS series went through a cosmetic make-over and were re-labeled as the EN (Eden Nemesis) series.