A15BT can be used to connect balanced and unbalanced devices having different signal levels or impedances. Depending on the configuration, the A15BT provides a minor increase or decrease in signal level. A15BT can be used to: connect a mono output from an FM tuner or receiver to the input of a microphone mixer, connect a high-impedance microphone to a medium-impedance input on an audio recorder, connect a balanced line-level output from a mixer to an unbalanced Aux-level input on an amplifier or recorder, convert an unbalanced Aux-level output to a balanced 600 ohms line output (example: Shure SCM268 Mixer).