 The Ultra Stereo JS series model 105/195 unit introduced a six channel discrete input module (JFM-20 SR) circa 1993 which creates a THX approved 5.1 surround field.This is a line level input that can accept the output from a DVD player with 5.1 discrete channel outputs.The JS series eventually evolved into later models, including the JSD-80, JSD-100, and now the JSD-60.