TOA U-12S unbalanced line input module for unbalanced, line level sources such as AM/FM tuners, casette decks, CD players, computer sound cards, jukeboxes, mixers and satellite receivers. Use For Adjacent Sources (less than 15 feet from the hos unit). Responds To Mute Bus Activation, via Mute SEND module or switch-closure. Responds To Both Mute Bus #1 And Mute Bus #2 By Default (cut jumper(s) to disconnect individual mute bus).