The B-11S is an input module for use with TOA 900 series amplifiers. It has a removable terminal block connector and supports balanced or unbalanced line level signals from devices such as CD players, tape decks, or AM/FM tuners. The unit is transformer-isolated to minimize ground loop problems when connected to remote equipment. It also responds to mute bus activation. Simply plug the B-11S into the module slot on your 900 series amplifier and you're instantly ready to connect a line level terminal block input.