Due to a multitude of details, the PDI01 is a higher-quality product than the PAN01. To mention only a few examples: The die-cast housing of the PDI01 is much more elaborate than the sheet metal housing of the PAN01; the XLR socket of the PDI01 is a classic all-metal design; the PDI01 transformer can process even higher levels without distortion; the PDI01 level attenuation is switchable with two settings; and the ground lift switch includes a soft ground setting.