RB-LI2, Active line isolation. RB-LI2 is intended to galvanically separate lines to avoid hum. 2 inputs with XLR connector to 2 outputs that are buffered and have a transformer. There are also 2 loop outputs so you can easily connect LI2 to an existing line to create a balanced galvanically isolated tap. Size: 1/2 19 / 1U. RK1 is available for rack mounting