Just saw this and I thought it was very clever. A compact, simple passive DI with Jensen transformer and 20dB pad, but the ground lift is controlled by the application of phantom power! I would love to have a few of these on festival stages.
http://www.fullcompass.com/product/398904.html
http://www.switchcraft.com/Documents/NPB589-_SC900_Phantom_Lift.pdf
http://www.fullcompass.com/product/398904.html
http://www.switchcraft.com/Documents/NPB589-_SC900_Phantom_Lift.pdf