The PAN 01 PRO Professional Passive DI Box features a 2mm steel housing and heavy duty metal switches for the PAD and ground lift functions, to withstand the rigors of the road and stage. The transformer has been completely redesigned and scaled-up with a larger magnet core for increased dynamic range and headroom, and a metal cover for improved shielding. Also, the PAN01 PRO's parallel out is switchable to double, as an additional input. This feature enables the summing of a stereo output (e.g. of a keyboard) with the resulting mono signal present at the PAN01 PRO's balanced XLR output.