TOA L-41S is a 600 ohm balanced line input module mute send with screw terminals. For Applications Requiring 600 ohm Line Matching. Transformer Isolation (600 ohms) minimizes ground loop problems when connecting remote equipment (greater than 15 feet). Signal At Input Terminals Activates Both Mute Bus #1 and Mute Bus #2 Buses By Default (cut diode(s) to disconnect individual mute bus). Connector:removable terminal block.