Pro Intercom AD920 Balanced/Unbalanced InterfaceThe AD920 Balanced Unbalanced Interface provides impedance matching and signal conversion between a balanced intercom circuit and an unbalanced intercom circuit. Both channels become audio and light signal compatible. Power may come from either intercom circuit or from both simultaneously. This is particularly useful for production crews wanting to use their unbalanced system with a balanced house system. Each circuit to be used will require its own