An electronic apparatus that includes a first port configured to receive an incoming audio signal, a second port, and a controller configured to be coupled to the first port and the second port. The electronic apparatus further includes a switch configured to selectively decouple the controller from the second port when the first port receives the incoming audio signal. Decoupling the controller prevents an electrostatic discharge occurring on the second port from reaching the controller when the controller is receiving the incoming audio signal from the first port.