- For Applications Requiring 600 ohm Line Matching. - Transformer Isolation (600 ohms) minimizes ground loop problems when connecting remote equipment (greater than 15 feet) - 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) - Connector: removable terminal block.