The PDI double-shielded D.I. box provides increased protection against noise and interference. Features 1/4 high impedance from instrument wired in the panel. Makes no difference which is used for input or output. 1/4 high impedance goes to your amp when input/output is used as a loop. Balanced and floating low-impedance XLR goes to your workstation or mixing console and ignores +48V phantom power. The Lift mode severs ground connection between the input and the XLR output and ground remains connected in GND mode.